CARRARO S.R.L.
Contents
1. nennen nennen nennen nnne nnne sena resa nnns 18 12 Using the Stop RETE T TT 20 22 elezione 23 15 AdjUSINO DIOW GOWT 24 16 24 17 Periodic safety valve inspections 25 18 TOUD SS NOOU mmi 26 MERE m 27 Se MON EET T 27 21 Checking and servicing springs 30 22 31 DF 33 3 A 20090 SEGRATE E Fermi IMIO027E doc RRAR S L E MAIL info carrarovalvole it Rev 1 12 07 02 VALVOLE E STRUMENTAZIONE 1 02 269912 1 FAX 02 2632 2452 Page 2 of 33 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 1 GENERAL INFORMATION 1 1 RIGHT TO MAKE MODIFICATIONS AND COPYRIGHT The regulations standards etc mentioned in these operating instructions are based on the knowledge that was available when they were drawn up and are not subject to modification Users are responsible for applying the latest versions of these The supplier reserves the right to make modifications and technical improvements to data and information whenever it2. Pull off the lever 20 Unscrew the sleeve 17 and remove the drive shaft 19 Pay attention to the gasket 21 Loosen the lock nut 12 and turn the calibration screw 13 clockwise to increase calibration pressure and anti clockwise to decrease calibration pressure Tighten the lock nut 12 Screw up the cap 14 until it comes to rest against the gasket 22 make sure it is not damaged positioning it so that the threaded hole for the lever is on the opposite side to the valve discharge i Reassemble the various parts of the lever 17 20 making sure that the gasket 21 is not damaged that the cam of the drive shaft is facing downwards with a play of about 1 5 mm with the nut 15 The above is easy to check as the lever must move freely for a short distance If this does not happen adjust the nut and lock nut 15 and 16 oe oS gt lt 14 3 Calibrating safety valves without lifting lever CS 31 Figs 4 6 To adjust calibration pressure proceed as follows a Remove the seal if present and unscrew the cap 28 in Fig 4 or 27 in Fig 6 b Loosen the lock nut 12 and turn the calibration screw 13 clockwise to increase calibration pressure and anti clockwise to decrease calibration pressure c Tighten the lock nut 12 and reassemble the cap 28 in Fig 4 or 27 in Fig 6 CARRARO S R L 20090 SEGRATE MD via E Fermi E MAIL info carrarovalvole it Rev 1 12 07 02 VALVES AND
3. 5 also apply to these valves 16 1 3 Fluid leaks in valves without lifting lever type CS 31 Figs 4 6 Normal operating pressure must always be at least 10 lower than calibration pressure otherwise the sealing force exercised by the spring on the disc will be so weak that a slight pressure peak is sufficient to cause a leak If there is a very slight leak of fluid a hissing sound can be heard when the pressure has almost reached the opening point this is not a problem but just indicates that the sealing surfaces of the seats are slightly irregular A larger leak instead indicates that the seat is damaged Continuous leakage may also occur at normal operating pressure which is considerably lower than the closing pressure of the valve CARRARO S R L 20090 SEGRATE MD via E Fermi E MAIL info carrarovalvole it Rev 1 12 07 02 VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 16 2 Hammering Hammering is caused by the disc rapidly opening and closing on the seat and must be eliminated immediately to prevent the seats from being ruined Hammering can be caused by 1 insufficient closing pressure drop 2 inlet pipe too long or diameter of end too small 3 insufficient flow 4 excessive counterpressure due to the outlet pipe being too long or its cross section being too small 5 obstruction or clogg
4. Disc with a metal or resilient gasket Each valve is marked with the following code CS Carraro Safety 30 Valve with unsealed frame 31 Valve with sealed frame D E F G H J Valve with cast iron frame A Valve with carbon steel frame Valve with stainless steel frame S Valve with threaded ends F Valve with flanged ends 1 2 3 Version L Valve with lifting lever E Resilient gasket Example CS 31F GS1L CS 31 valve with F orifice cast iron frame threaded ends standard version lever 20090 SEGRATE MD E Fermi CARRARO 5 E MAIL info carrarovalvolet VALVOLE STRUMENTAZIONE TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 3 __ 141 ys m p unum um um ums um um umm mm Lm i P p amp MB amt um cuum lt lt lt LAIT LJ EE Fig 2 Valvolatipo CS 30 Attacchi filettati CS 30 typevalve Screwedends Fig 1 Valvola tipo CS 30 Attacchi flangiati 1 Corpo valvola Valve body CS 30 typevalve Flangedends 2 Sede Nozzle 3 Anello regolazione Adjusting ring 4 Portatappo Holder 4a Tappo Disc Anello per asta Stem ring 6 Pistone Piston PART A TAPPI A TENUTA ELASTICA 7 Piattello inferiore Lower washer RE
5. INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 15 ADJUSTING THE CLOSING PRESSURE DROP BLOW DOWN When the reason why the safety valve opened has been eliminated the pressure in the protected equipment starts decreasing The valve always closes at a lower pressure than calibration pressure The difference between closing pressure and calibration pressure is simply defined as the CLOSING PRESSURE DROP BLOW DOWN and is expressed as a percentage of the calibration pressure E g Calibration pressure 10 0 bar Closing pressure 9 5 bar CLOSING DROP 0 5 bar that is a closing pressure drop of 5 To modify blow down remove the lock nut from the adjusting ring 21 in Figs 1 and 2 or 25 in figures 4 6 and use a pointed tool to turn the adjusting ring 1 or 2 notches at a time Turn the ring anti clockwise to lift it and increase the closing pressure drop turn the ring clockwise to obtain the opposite effect If the adjusting ring 4 is difficult to move due to impurities that have deposited in the thread release it by lightly hitting the frame near the ring After completing calibration operations make sure that the seal if present is applied 16 OPERATING PROBLEMS The most common problems are leaks hammering and blocking with the valve partially open Some problems are caused by wear damage to internal components or faulty ins
6. SEGRATE MD via E Fermi E MAIL info carrarovalvole it Rev 1 12 07 02 VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 Fit the stop screw as follows CS 30 Figs 1e2 Remove the seal 30 and the split pin Pull out the pin 15 and the lever 19 Loosen the cap screw 20 Pull out the cap 18 Screw the cap onto the calibration screw until it touches the calibration screw nut Tighten the stop screw Fig 9 oe a CS 31 Fig 3 5 Remove the seal Pull out the pin 18 and dismount the lever 20 Pull out the sleeve 17 with the related gasket 21 Remove the drive shaft 19 Screw up the cap 14 Mount the cap with the stop screw Fig 10 CS31 Fig 4 6 1 Remove the seal 2 Dismount the cap 28 3 Mount the cap with the stop screw Fig 10 Tightening the stop screw by hand is sufficient to ensure valve does not leak even when the pressure rises above the calibration point CARRARO S R L 20090 SEGRATE MD via E Fermi E MAIL info carrarovalvole it Rev 1 12 07 02 VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 13 STARTING SYSTEM ATTENTION The valve was factory calibrated with compressed air at ambient temperature and atmospheric coun
7. cross section of the outlet connection of the valve If more than one valve is connected to one outlet pipe its cross section must be at least equal to the sum of the cross sections of all the outlet connections of the valves in question All safety valve discharges must be conveyed along piping that does not obstruct walkways or platforms The outlet piping must be fitted with drains near the safety valves where water or condensate may collect Each valve body is fitted with a service connector under the seat which is connected to a pipe conveying the discharge to a safe outlet area If a silencer is used on a safety valve it must have sufficient cross section to prevent counterpressure from exceeding 25 of calibration pressure so as not to interfere with the discharge capacity of the valve Silencers or any other pieces of equipment must be built in such a way as to prevent the outlet lines from being clogged by scale deposits The discharge and drain pipes must be installed in such a way as not to apply force on the safety valve as this could distort the body and cause leakage Please bear in mind the following points a The outlet piping must not be supported by the valves The maximum weight applied to the valve outlet must be no more than that of a flange b There must be enough air between the outlet pipe and the discharge line to avoid interference due to movements of the manifold the valve and the outlet piping caused by heat expa
8. in mind that when turning all the profiles must be perfectly reproduced otherwise the safety valve will not work correctly LAPPING RINGS 70 01 T0650 70 01 T0651 ABRASIVE PASTE Type ___ Function Tetrabor Tetrabor Tetrabor 1000 Polishing Two lapping rings are recommended for each orifice 20 5 Discs with resilient gaskets CARRARO S R L 20090 SEGRATE MD via E Fermi E MAIL info carrarovalvole it Rev 1 12 07 02 VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 When the discs are fitted with resilient gaskets the metal seats on the body remain in a better state If they are marked or worn the contents of the previous paragraph apply If the resilient gaskets of the disc are marked hollowed or any way deteriorated replace them This is quick and easy operation 21 CHECKING AND SERVICING THE SPRINGS MOUNTED ON SAFETY VALVES The surfaces of safety valve springs are protected by a treatment or lining that is suitable for the environmental conditions indicated by customers in their requests and orders no specific indications are given the installation environment is presume to be standard for factories without aggressive atmospheres power stations or normal civil installations If they are installed outdoors the valves are presumed to have been protected from bad weat
9. may also contain a more precise definition of the risk and its effects on people 1 DANGER Immediate risk which will certainly cause serious injury or death 2 WARNING Risk or hazardous behaviour which may cause serious injury or death 3 CAUTION Risk or hazardous behaviour which may cause minor injury 4 ATTENTION Risk or hazardous behaviour which may cause damage to property 1 2 3 4 WARNING CAUTION ATTENTION Do not loosen the bolts if the pipes are pressurised as this may cause serious injury or death Mark all possible discharge Wear safety clothing or Do not knock or drop the valves or leak points to prevent the risk of serious injury or death So enh of injury 20090 SEGRATE via E Fermi CARRARO S R L E MAIL info carrarovalvole it VALVOLE E SRUMENTAZIONE TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 5 SAFETY WARNINGS Thorough maintenance operations and overhauls are important for the safe and reliable operation of all valves The service procedures recommended by CARRARO and described in this manual are effective methods for carrying out maintenance operations Some of these operations require the use of equipment that has been especially designed and built for this specific purpose This equipment must be used as and when recommended Please note that
10. of rounding of the downline corner must be equal to at least 1 4 of the flow diameter and will be gradually reduced so that a small part of the upline corner remains with a small rounding radius d Never fit safety valves to the line directly opposite a branch CARRARO S R L 20090 SEGRATE MI via E Fermi e e e E MAIL info carrarovalvole it Rev 1 12 07 02 VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 Fig 7A Fig 7B CS30 valves used with condensable vapours or gas CS30 and 31 valves used with non condensable vapours or gas drain _ drain Fig 7C Fig 7D C53 valves used with liquids or hot or overheated water C531 valves used with condensable vapours or gas Remove Remove existing disc existing disc drain PRECAUTIONS FOR OUTLET PIPING Distance L As short as possible gauge plus twice the diameter of the outlet piping If the discharge piping is longer than the maximum indicated length suitable supports must be fitted so as not to exercise externally generated forces on the valve e g expansion to support the weight of the piping and the reaction forces caused by the discharge Detail B Firmly anchor to the structure of the building 20090 SEGRATE MI via E Fermi CARRARO S R L E MATL VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INS
11. this service manual contains various warning and caution notices which should be read carefully in order to minimise the risk of injury to people or the possibility of using incorrect work methods which may damage the valves or make them unsafe is important to realise however that these warnings cannot be exhaustive CARRARO is unable to know assess and inform customers or users of all the conceivable methods of performing maintenance operations and all the risks deriving from the use of such methods Consequently CARRARO has not even attempted to start such a task Therefore whoever uses a service method or piece of equipment which is not recommended by CARRARO must make sure that neither his own or other people s safety nor valve safety and performance are jeopardised by the chosen method In case of doubt about the method used please contact CARRARO Testing installing or dismounting the valves or accessories may cause you to come into contact with fluids at very high pressures or temperatures and or corrosive or erosive Therefore take all safety precautions while testing installing or dismounting the product these include wearing ear plugs goggles and safety clothing such as gloves both in or near the work area Given the large number of conditions and circumstances that may arise while working on the products and the consequent risks deriving from the way this is done CARRARO is not able to prevent all risks of injury to peopl
12. 8 531009 OOL ONIY TIVWS 001 dO3G 38h S33Ud ONISOTO 9 dONQ j4nSsS3Md ONINAdO SAISSSOXS ATSLIIdWOOD 35010 LON 5300 ONINAdO N3HM 5120 18 SATIVA JHL NadO SdOd HO 1 SATIVA AHL YSWWIS SSIH 9NIN3dO 3fY1VA NOLLVYEITVD LO38809NI AT3l3ldWOO 3510 LON 9300 3A TVA 12 07 02 Page 26 of 33 1 10027 E MAIL info carrarovalvole it TEL 02 269912 1 FAX 02 2692 2452 20090 SEGRATE MI via E Fermi LL 2 LLI 2 5 2 2 lt LLI gt l lt gt N 04 4 QC 04 5 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 19 MAINTENANCE 19 1 Spare parts When ordering spare parts quote the series number type size and calibration pressure of the valve and whether it is used with saturated or overheated steam or another fluid Each cross section drawing of the valves shows which spare parts should be kept in stock in order to carry out rapid repairs ATTENTION Before dismounting and servicing the valve make sure it is not pressurised 20 DISMOUNTING SAFETY VALVES 20 1 Dismounting safety valves with lifting lever type CS 30 Figs 1 2 Remove the seal if present and the split pin Pull out the lever pin 15 and the lever 19 P
13. ECOMMENDED SPARE PARTS gruppi di partic 28 29 30 31 32 33 34 sono fornibili in unico set Note Part units 28 29 30 and 31 32 33 34 are supplied in one set only 31 32 33 20090 SEGRATE MD via E Fermi CARRARO S R L E MAIL info carrarovalvolet Page Gof 33 VALVOLE E STRUMENTAZIONE TEL 02 263312 1 FAX 02 2692 2452 Page 6 of 33 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 4 PRODUCT SAFETY INDICATIONS AND TAG SYSTEM If and where appropriate safety indications have been put inside tags the sides of the pages of this manual These rectangular tags are placed vertically as shown in the following examples and contain four different messages communicating The level of risk The nature of the risk The effects of the risk on people or products Instructions if necessary on how to avoid the risk The box at the top contains a warning word DANGER WARNING CAUTION ATTENTION which indicates the level of risk The box in the middle contains a drawing indicating the nature of the risk and its possible effects on people and property In the event of risks for people the drawing may suggest what preventive measures can be taken such as wearing safety clothing The box at the bottom may contain a message with instructions on how to avoid the risk In the event of risks for people the message
14. G SAFETY VALVES 22 1 Reassembling safety valves with lifting lever type CS 30 Figs 1 2 Screw the adjusting ring 2 into the seat assembly 1 in Fig 1 or 22 in Fig 2 the head of the ring must be flush with the seat Lubricate the spring washers 7 and 12 on the conical section in contact with the piston and calibration screw respectively the lower tip of the rod 10 in contact with the disc 4 and the lower inner part of the screw 13 Insert the rod washers spring assembly taking care that the two half rings 5 are firmly fitted in their seat Mount the disc 4a and disc holder 4 on the rod 10 Screw up the seat assembly 1 on the frame 9 and secure Tighten the calibration screw 13 until all play has been eliminated and add the same number of turns used to lift the screw when the valve was dismounted Tighten the lock nut 14 Move the adjusting ring 3 to its original position as follows Use a sharp tool to slowly turn the ring to the right until it touches the disc 4 Turn the ring to the left counting the same number of notches previously counted when dismounting the valve in order to return it to its original position Tighten the reference screw 21 and put back the seal if present Mount the nut 16 and the lock nut 17 Temporarily mount the cap 18 and lever 19 making sure that there is a play of about 1 5 mm between the nut 16 and the lever After che
15. INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 C A 20090 SEGRATE E Fermi IMIO027E doc RRAR S L E MAIL info carrarovalvole it Rev 1 12 07 02 VALVOLE E STRUMENTAZIONE TEL 02 263312 1 02 2092 2452 Page 1 of 33 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 TABLE OF CONTENTS Page nire daa 1 0 ETE 3 PEG EEE E 3 3e OM Ns CONS m 3 Cross section drawing of CS30 figs 1 and 2 4 Cross section drawing of flanged CS31 figs and 4 5 Cross section drawing of flanged CS31 figs 5 and 6 6 MES 21710 EE 7 EE SCN E 8 i Cel IONS REIR 9 7 Safety valve terminology ccccsccccssececsececeeececeeceseeeeseueeseaeeeseueessueesseeeeseueesseeeeseesesseeeesaes 10 8 Transport storage and handling sess 12 D MAINT MLS 14 10 Installation recommendations 14 11 Determining reaction forces
16. NTION Never lift the valve using the lever Lift packed valves with the inlet flange at the bottom Use a hand held trolley to move and position the valve inside the work area or a forklift truck for large valves During lifting to the installation point take care not to knock the valve against the metal structure or other objects A ATTENTION If the valve is knocked violently have it checked by CARRARO before installing it CARRARO S R L 20090 SEGRATE MD via E Fermi E MAIL info carrarovalvole it Rev 1 12 07 02 VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 9 LIMITS TO USE 9 1 The Carraro 530 531 safety valves were not designed for use with cyclical loads 9 2 The CS30 CS31 valves were designed for use at temperatures below the limits at which viscous flow phenomena occur 10 INSTALLATION RECOMMENDATIONS 1 Valves can be used to a Protect steam generators b Protect steam or gas distribution networks or tanks generally downline from the pressure reduction valves In both cases please refer to the installation diagram in Fig 7A 7B 7C 7D 2 he valves must be mounted vertically directly on the equipment or piping being protected 3 No valve of any type must be installed between the safety valve and the manifold or on the outlet pipe between the safety v
17. ONIdld L3 111010 AHL YSALAWVIG JHL 9NISV3HONI 3480SS3H8d L31L00 3960038 O31 VNINWI 13 N338 SVH W3 1808d JHL TIN LV3dg38 NIVOV AYL ANY V LV HOLON 13313HL OL ONIY AHL 83MOT AONVYAIOL 23H92 NV31O SI N31SAS JHL SELIQ V4 31VNIWIT3 3ATVA SHL LNNOWSIG Q3 VNIWIT3 SVH JHL 1 NIVOV AYL V LY HOLON 1331 SHL OL ONIY YSAMOT AMNVSS3O3N SV 1234400 ALIOIHLN3ONOO H3HSVM AGIND SNIHdS H3MO1 H3LLOHS ANY 1V3S JHL JO LOVINOO JHL 193dSNI 3ATIVA JHL AMNVSS3O3N Al LOHS SHL 39V 1d3 NV S1V3S JHL JHL LNNOWSIO SNOSV3M JHL 31VNIWIT3 31V9ILLS3ANI SHL dN JNTVA NOILVESITVO JHL LSnf Gv NY312 SI W31SAS JHL 3418 8 SLVNIAITA SA TVA SHL LNNOWSIC 3 df NOILOV NOSV3M 3 18ISSOd YALAWNVIG 3ATVA LO3HMNHOONI L3 TNI JHL NI 3Hf1SS3Hd 3AISSHOX3 OO 3 15583 9 31 3AISS3OX3 OOL ANY YALLNHS 38 1L938809NI 5 OOL 9NIS LALLNO SATWA 3H1 SADYOSA ON did 1311410 JHL SLN3NOdNWOO 9 S1V3S SNOILVMSH8IA 3N MOT 001 aaisnrav ATLO3HHOONI 5 3dini o ANY 1 1 8 SHL N33AAL3
18. SILIENT TIGHTNESS DISC Bord 9 Incastellatura Bonnet 10 Asta Stem 11 Molla Spring 12 Piattello superiore Upper washer 13 vite di taratura Compression screw 14 Controdado Lock nut 15 Perno leva Lever pin be Dado per asta Stem nut Dado Nut 23 24 25 26 27 28 29 18 Cappello Per orifici tipo Per orifici tipo 19 Leva Lever For orifice type For orifice type 20 Vite Screw D E F G H J 21 Vite anello regolaz Adjusting ring 22 pin 23 Corpo Sede Nozzle body 24 Tappo Disc 25 Vite guarnizione Gasket screw 26 Guarnizione Gasket RICAMBICONSIGLIATI RECOMMENDED SPARE PARTS 27 Tappo Disc gruppi di partic 23 24 25 e 26 27 28 29 sono fornibili in unico set 28 Vite Screw Note Part units 23 24 25 and 26 27 28 29 are supplied in one set only _ Sieillo guarnizione Gasket plate 20090 SEGRATE MD via E Fermi CARRARO S R L E MAIL info carrarovalvolet VALVOLE E STRUMENTAZIONE TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 2 i 1 Fig 3 Valvolatipo 5 31 Con leva Fig 4 Valvola tipo CS 31 Senzaleva CS 31 type valve With lever CS 31 type valve Withoutlever 1 Corpovalvola Valve body 18 Pernoleva Leverpin 2 Guarnizione Gasket 19 Alb
19. TRUCTIONS For installing and servicing safety spring valves series CS types 30 31 Strong vibrations in the piping can modify the calibration of a safety valve Vibrations can cause beating and therefore damage the valve and reduce its discharge capacity They also contribute towards increasing the frequency of leaks from the seats Take great care to eliminate this problem before operating the valves on the system Steam flowing vertically from a discharge elbow causes a downward reaction on the elbow Bending force on the valve is determined by the product of the reaction force multiplied by the arm of the moment between the steam outlet point and the section that is considered to be subject to bending When designing the overall system of a safety valve the effects both of the reaction forces and of the vibrations and seismic loads on all the valve components and outlet piping must be considered To ensure perfect performance a regular control and maintenance service must be performed In order to do the above effectively the valves must be easy to access There must be enough free space around the valve to allow access to the adjusting rings If one or two valves are mounted nearby the outlets should be parallel in order to minimise the risk of injury to maintenance men The safety valves must be installed vertically Rated tolerance is 1 degree The cross section of the outlet pipe of a safety valve must be at least equal to the
20. aintenance manual capacity CARRARO S R L 20090 SEGRATE MI via E Fermi e e e E MAIL info carrarovalvole it Rev 1 12 07 02 VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 Reaction forces CS 30 31 valves 3 500 3 000 3 2 500 H 212 f 2 000 7 7193 Put LL P d Pd P L 212 a V4 0 7 14 21 28 35 42 49 56 63 70 Pressure CARRARO S R L VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 12 USING THE STOP SCREW Safety valves protecting steam generators may have to undergo a hydraulic test Hydraulic test pressure is always higher than the calibration pressure of the safety valve As it is best not to alter the valve calibration before performing the hydraulic test block the disk with the stop screw with bracket see Figs 9 10 N ATTENTION Only use the stop screw when testing pressure is not less than 80 of calibration pressure ae Cms mcr me al Fame Lau Br er nr Ru CS30 9 cS31 10 CARRARO S R L 20090
21. alve and the atmosphere 4 n no case may the valve inlet pipe have a smaller diameter than the rated dimension of the valve inlet and it must be no longer than three times its diameter 5 An elevated pressure drop at the valve inlet will cause rapid opening and closing which is known as beating This may both reduce discharge capacity and damage the surface of the valve seats Very strong and prolonged beating may also cause damage to other parts of the valve The following tips will help to eliminate the factors which cause beating a The corners of the stub pipe on the manifold must be rounded with a radius not less than 1 4 of the diameter of the opening b Pressure drops due to friction up to the valve inlet must not exceed half the rated closing pressure drop Blow down for the valve To decrease the effects of this phenomenon known as resonance proceed as follows a install the valve at a distance of at least 8 10 diameters after a curve in the piping This distance must be increased when the valve is installed in a horizontal section of the line preceded by a vertical section b a safety valve must never be installed at less than 8 10 diameters both upline and downline from a Y branch whether converging or diverging c If the layout of the piping makes it impossible or impractical to follow the above instructions the corners downline from the stub pipe must be rounded more than the upline corners The radius
22. as not to apply force on the valve under any operating conditions For valves with threaded ends screw in and tighten the nuts on the inlet stub pipe using belt or chain wrenches gripping the valve on the cylindrical part of the frame Never suddenly tighten the valve or knock it Never use lever or pipe wrenches Any gaskets or products used to improve the seal of the inlet end threads must not obstruct or deposit in the valve inlet duct The same applies when tightening the discharge pipe CARRARO S R L VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 11 DETERMINING REACTION FORCES The figure the left shows 530 31 safety valve in its various operating modes When the valve is closed Fig 1 an upward force is exercised on the valve collar by to the internal pressure of the valve Valve collars are built in such a way as to withstand the force Fp and tangential stress caused by internal valve pressure When the valve opens Fig 2 the force Fp remains constant until overpressure The combined force of calibration pressure plus overpressure Fsp must be balanced by the opposing forces the valve collar i 2 After the valve opens and before the fluid starts flowing through the e 4 outlet curve a reaction force FF acts laterally to the valve outlet If the valve
23. cking the above secure the nut and lock nut 16 and 17 J Secure the cap lever pin 15 and split pin Put back the seal if present to guarantee calibration 2 22 2 Reassembling safety valves with airtight lifting lever type CS 31 Figs 3 5 Screw the adjusting ring 3 into the seat assembly the head of the ring must be flush with the seat Lubricate the spring washers 7 and 11 on the conical section in contact with the piston and calibration screw respectively the lower tip of the rod 10 in contact with the disc 4 and the lower inner part of the screw 13 Insert the rod washers spring assembly making sure that the two half rings 24 are firmly fitted in their seat Mount the disc 4a and disc holder 4 on the rod 10 Screw the seat assembly into the frame 8 and secure it Tighten the calibration screw 13 until all play has been eliminated add the same number of turns used to lift the screw when the valve was dismounted Tighten the lock nut 12 Move the adjusting ring 3 to its original position as follows a Usea sharp tool to slowly turn the ring to the right until it touches the disc holder 4 b Turn the ring to the left counting the same number of notches previously counted when dismounting the valve in order to return it to its original position Tighten the reference screw 25 and put back the seal if present Mount the nut 15 and the lock nut 16 so t
24. der the heading popping pressure This pressure value is stencilled on the rating plate 20 Seat The seat is the contact between the fixed and mobile parts of the pressure limiting devices of a valve 21 Sealing pressure of the seat This is the specified inlet static pressure at which a quantitative measurement test of the loss is made according to a standardised procedure 22 Seat diameter This is the smaller diameter of the annular contact surface between the fixed and mobile parts of the pressure limiting devices of a valve 23 Simmer This is the audible or visible leak of fluid between the seat and disc at an inlet static pressure lower than the popping pressure and with a non measurable rate of flow CARRARO S R L VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 8 TRANSPORT STORAGE AND HANDLING 8 1 Transport Depending on their size safety valves can be transported loose packed in cardboard boxes or in wooden crates All the valve ends are fitted with covers to prevent dirt from entering Packs can be placed on pallets if required Follow all and any indications written on the packaging A ATTENTION Do not lift horizontally or attach to the lifting lever or the spring Operators moving loads must take all necessary precautions to prevent accidents 8 2 Storag
25. djusting ring 3 to the right until its touches the disc 4 Count and write down the number of notches the ring was moved by as it must be returned to its initial position when reassembling it Loosen the lock nut 12 and unscrew the calibration screw 13 anti clockwise counting the number of turns before the spring is completely released Tighten the valve body 1 in a clamp and loosen the connection between the valve body and the frame 8 only using a belt wrench never use pipe wrenches or any other plumber s wrench as these could damage the frame Unscrew and remove the frame 8 from the valve body 1 Remove the disc 4a and disc holder 4 Pull out the rod washers spring assembly Take care not to lose the two half rings 24 as they may leave their seat when the spring 15 released Remove the adjusting ring 3 from the seat assembly 1 CARRARO S R L 20090 SEGRATE MD via E Fermi E MAIL info carrarovalvole it Rev 1 12 07 02 VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 20 4 Lapping the seats To true the sealing surfaces of the disc 4 and nozzle 2 use a smooth cast iron ring available from CARRARO on request and abrasive paste Never use the disc to lap the seat but always the above smooth cast iron ring 1 keep the pieces clean 2 frequently apply new abrasive past
26. e Safety valves must be kept in a dry place to protect them from atmospheric conditions They may only be removed from their crates or packing immediately prior to installation The flange protections and covers must be kept on until the last moment Safety valves whether packed or not must not be subject to violent knocks Do not allow foreign bodies Valves whether packed or not must always be kept upright that is to entering the valve inlet and never lying on one side in order to prevent distortion and damage to outlet internal parts 8 3 Handling When unpacking the valves and removing the flange protectors immediately prior to installation take great care to make sure that foreign bodies do not enter the valve inlet and outlet holes while it is being connected A ATTENTION Handle with care Do not drop or knock When handling the valve make sure the work area is kept clear in order to prevent injury to people and damage to property 20090 SEGRATE via E Fermi CARRARO 5 L E MAIL info VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 Unpacked valves must be moved by hand or lifted by winding a chain or hemp rope around the neck of the outlet end and then around the upper part of the frame so as to make sure that the valve remains vertical during lifting and is never horizontal ATTE
27. e and damage to property and can only help by asking you to take the utmost care and giving you the following safety suggestions Users of CARRARO products are responsible for training the staff that will use the product is extremely important for these people to acquire a thorough knowledge of the instructions of the product especially the ones contained in this manual CAUTION Wear safety clothing or l prevent Ihe nex injury CARRARO S R L VALVOLE SRUMENTAZIONE TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 6 SAFETY PRECAUTIONS Always observe the current plant safety regulations together with the following indications Always decrease operating pressure before adjusting the valve When operating or testing a valve never remain on the discharge side of it Use ear plugs when testing or operating a valve Wear safety clothing Hot water can scald you and overheated steam is invisible Decrease pressure and keep away from the discharge side when operating a valve in order to injury When dismounting safety valve keep at a suitable distance from death and or wear safety clothing to prevent being sprayed by any process fluid that may have accumulated inside Make sure the valve is isolated from any pressure source in the system before
28. e on the lapping ring 3 apply a very thin layer of abrasive paste on the lapping ring This will prevent the edge of the seat from rounding take care not to hit and dent the seat with the lapping ring 5 proceed with lapping by pressing the ring uniformly onto the seat in all directions and rotating slowly in alternate directions When lapping the disc keep the ring still and move the disc as described above new paste frequently after removing the old paste 7 to check the lapping on the seat remove all the abrasive paste from the seat and from the lapping ring Polish the seat with the perfectly clean lapping ring using the above described movements If there are any depressions in the sealing surface they will appear matt in contract with the polished part In this case further lapping is required Bear in mind that for successful lapping always use a lapping ring with perfectly flat surfaces to remove shading just a few minutes of lapping are required 8 any radial lines appearing after lapping can be removed by turning the lapping ring around its axis after removing all the abrasive paste Carefully wash the seats with kerosene light oil or carbon tretrachloride and clean with tissue paper or a non frayed cloth If the indentations in the seat or the disc are such as to require lapping deeper than 0 25 mm return the valve to Carraro for repairs unless you have a workshop fitted out for this kind of work Bear
29. ero comando Contro shaft PART A TAPPI A TENUTA ELASTICA 3 Anello regolaz Adjusting ring 20 Leva Lever RESILIENT TIGHTNESS DISC 4 Portatappo Holder 21 Guarnizione Gasket Tappo Disc 22 Guarnizione Gasket 5 Tuboeiettore Eductortube 23 Guida Guide Per orifici tipo 6 Pistone Piston 24 Anello perasta Stemring Fororifice type 7 Piattello infer Lowerwasher 25 Vite anello regol Adj ring pin D E F 8 Incastellatura Bonnet 26 Guarnizione Gasket 9 Molla Spring 27 Sede Nozzle 10 Asta Stem 28 Cappello Cap 11 Piattello superiore Upperwasher 29 Tappo Disc 12 Controdado Locknut 30 Viteguarniz Gasket screw 13 Vite ditaratura Compression screw 31 Guarnizione Gasket 14 Cappello Cap 32 Tappo Disc 15 Dadoperasta Stemnut 33 Vite Screw Per orifici tipo 16 Dado Nut 34 Piattelloguarn Gasketplate Fororifice type 17 Manicotto Sleeve 35 Guarnizione Gasket G H J 36 Sigillo RICAMBI CONSIGLIATI RECOMMENDED SPARE PARTS 1 gruppi di partic 29 30 31 e 32 33 34 35 sono fornibili in unico set 32 33 34 35 Note Part units 29 30 31 and 32 33 34 35 are supplied one set only 20090 SEGRATE MI via E Fermi CARRARO S R L E MAIL info carrarovalvolet Page5of33 VALVOLE E STRUMENTAZIONE 18 02 263312 1 FAX 02 2692 2452 Page 5 of 33 INSTRUCTIONS For installing and servicing safet
30. ffective closing pressure It is expressed as a percentage of calibration pressure or in pressure measurement units 3 Minimum cross section This is the minimum net cross section of the valve orifice or inlet see points E 1 D 2 1 6 1 7 1 8 Collection E ISPESL 4 Diameter of the minimum cross section This is the minimum diameter of the valve inlet 5 Beating Beating or hammering is an abnormal rapid and alternative movement of the moving parts of a safety valve with the disc hitting the seat 6 Closing pressure This is the decreasing static pressure value at the inlet at which the disc restores contact with the seat thereby reducing valve lift to zero 7 Disc The disc or shutter is the mobile part of a safety valve which closes the valve and limits the pressure 8 Inlet diameter This is the rated diameter of the inlet end of a safety valve unless otherwise specified 9 Rise The rise is the effective movement of the disc with respect to the closing position when the valve discharges 10 Manual operating device This is a device that is used to manually open a safety valve by applying a force which reduces the load of the spring that keeps the valve closed 11 Orifice In Collection E of ISPESL this is defined as the valve inlet see E 1 D 2 1 6 and it is the pressurised part comprising the inlet line up to and including the fixed part of the closing seats 12 Outlet diamete
31. hat the lower surface of the nut is flush with the surface of the frame see distance A Figs 3 and 5 as follows Orifices D E distance A 36 mm Orifices F distance A 52 mm Orifices H J distance A 60 mm Screw up the 14 until it comes to rest against the gasket 22 make sure it is not damaged positioning it so that the threaded hole for the lever is on the opposite side to the valve discharge CARRARO S R L 20090 SEGRATE MI via E Fermi e e e E MAIL info Gcarrarovalvole it Rev 1 12 07 02 VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 Reassemble the various parts of the lever 17 21 making sure that the gasket 21 is not damaged that the cam of the drive shaft is facing downwards with a play of about 1 5 mm with the nut 15 The above is easy to check as the lever must move freely for a short distance Put back the seal if present to guarantee calibration 22 3 Reassembling safety valves without lifting lever type CS31 Figs 4 6 Screw the adjusting ring 3 into the seat assembly the head of the ring must be flush with the seat Lubricate the spring washers 7 and 11 on the conical sections in contact with the piston and calibration screw respectively the lower tip of the rod 10 in contact with the disc 4 and the lower inner part of the screw 13 nsert
32. he seal if present and the spring pin 18 Pull off the lever 20 Unscrew the sleeve 17 and remove the drive shaft 19 Pay attention to the gasket 21 Unscrew the cap 14 Release the lock nut 16 and remove it from the rod 10 Unscrew the nut 15 Remove the seal if present and unscrew the lock nut 25 Turn the adjusting ring 3 to the right until its touches the disc 4 Count and write down the number of notches the ring was moved by as it must be returned to its initial position when reassembling it Loosen the lock nut 12 and unscrew the calibration screw 13 anti clockwise counting the number of turns before the spring is completely released Tighten the valve body 1 in a clamp and loosen the connection between the valve body and the frame 8 only using a belt wrench never use pipe wrenches or any other plumber s wrench as these could damage the frame Remove the frame 8 from the valve body 1 Remove the disc 4a and disc holder 4 Pull out the rod washers spring assembly Take care not to lose the two half rings 24 as they may leave their seat when the spring is released Remove the adjusting ring 3 from the seat assembly 1 20 3 Calibrating safety valves without lifting lever type CS 31 Figs 4 6 Remove the seal if present and unscrew the cap 28 in Fig 4 or 27 in Fig 6 Remove the seal if present and unscrew the lock nut 25 the a
33. her The springs are normally aluminium coated or protected with aluminium paint They can be used for many years without being damaged or attacked During routine system maintenance carefully check the surface of the springs If the surface protection is damaged carefully brush the area in question and restore the protection Carboline paint N 4631 APSA Milan can be used for this If experience shows that the local atmosphere tends to rapidly attack the protection further protect the painted surface with a layer of heat proof protective grease Springs housed inside a closed cover subject to temperature variations with the consequent possibility of humidity in the internal surfaces or springs coming into contact with the liquids they contain are more likely to suffer damage and must therefore be checked more frequently Bear in mind that in the long term rust or corrosion can reduce the resistance of the spring and can form localised concentrations of force which may create breakage points that can cause the spring to yield It is therefore essential to check and service the surface of the spring in order to keep the safety valve perfect working order CARRARO S R L 20090 SEGRATE MI via E Fermi e e e E MAIL info carrarovalvole it Rev 1 12 07 02 VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 22 REASSEMBLIN
34. ing of the external discharge hole on the frame of CS 30 type valves 6 obstruction of the eductor tube 5 in Figs 3 6 for CS 31 type valves If the valve is fitted with a lever hammering can be stopped by keeping the valve open with the lever until the pressure falls by about 7 8 below calibration pressure If the valve has no lever lower the pressure by adjusting the system upline from the valve In both cases immediately identify the reason for hammering and eliminate it 16 3 Blocking Blocking with the valve partially open can occur during the closing phase The main reasons for this phenomenon are 1 incorrect closing pressure drop 2 mechanical friction If a valve blocks when it is partially open check for friction and eliminate it If there is no friction turn the adjusting ring to the left clockwise by one or two notches When the ring lowers the problem is eliminated 16 4 Drop in calibration pressure Drops in calibration pressure are often attributed to the loss of elasticity of the spring Except in exceptional circumstances it is due to damage to the seats caused by foreign bodies hammering or uneven heat distribution in the internal parts of the safety valve between one discharge and another Carefully check for leaks before adjusting calibration Do not repeat tests at brief intervals but first allow the valve to cool 17 PERIODIC SAFETY VALVE INSPECTIONS To make sure the safety valves continue to w
35. nsion Movements due to vibrations temperature variations and reaction forces on the valve must also be considered c Metal hoses are not generally recommended if they are used to connect the valve to the outlet line they must be long enough and must be designed and installed in such a way as to never become rigid no matter how they are laid Safer results are obtained if hoses are installed to allow movements by bending rather than by stretching or axial compression Valves must always be lifted vertically Valves may be lifted with a sling around the frame and the neck of the outlet flange Never lift a valve from its control lever Do not hit or drop the valve during installation If the valve drops make sure it has not been damaged and check it is still correctly calibrated CARRARO S R L VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 Immediately prior to installation remove the protective covers on the valve inlet and outlet Make sure that the inside of the valve is clean No foreign bodies must be inside the valve inlet and outlet as these may damage the valve components or fall into the manifold Check all the seats to make sure they are clean and have no defects which could cause leaks Burrs scores unevenness etc are all possible reasons for faulty seals Before mounting the valve make sure that the gasket
36. ork correctly they must be tested at regular intervals Do this by opening them manually with the lifting lever during testing the pressure in the system must be at least 8096 of the calibration pressure of the valve open the valve just once for a brief period Testing frequency depends on the conditions of the system greater or lesser probability of the valve getting dirty for systems that are cleaned approximately every three months If the protected equipment is shut down carry out the test immediately prior to shut down in order to be able to perform any maintenance operations required For valves without levers the system operator must periodically check valve operation by increasing the pressure on the valve depending on system availability A ATTENTION Move the lever at a safe distance from the valve do this by using a piece of string tied to the hole of the lever CARRARO S R L VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 ONS NS TRUCT CS types 30 31 series o 2 c lt gt Gam 5 gt c LL TROUBLESHOOTING 18 JHL 3ZIS AHL NMOQ M078 Q38In033 JHL 5531 A8 3sf1SS3sd L3 TINI AHL 390038 Q3 VNIWIET3 N338 SVH W31808d JHL LV3d3 NIVOV AYL SWIL V LV HOLON LHOW JHL OL ONIY JHL dN 14
37. r This is the rated diameter of the outlet connector of a safety valve unless otherwise specified 13 Overpressure This occurs when pressure exceeds calibration pressure and is normally expressed as a percentage of calibration pressure 14 Popping pressure This is value of increasing static inlet pressure at which the disc opens at a much higher speed than at higher or lower pressures Popping only occurs in safety valves applied to compressible fluids 15 Pressure limiting device This is any part of the safety valve which comes into effective contact with the pressurised fluid inside the protected container CARRARO S R L 20090 SEGRATE MI via E Fermi e e e E MAIL info carrarovalvole it Rev 1 12 07 02 VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 16 Pressure retaining device This is any part of the safety valve which exercises and undergoes stress while keeping one or more pressure limiting devices in position 17 Total rise This is the rated rise at which a valve reaches its rated discharge capacity rated flow 18 Popping safety valve This is a safety device operated by inlet static pressure featuring rapid opening or popping 19 Calibration pressure This is the value of the inlet static pressure at which a popping safety valve performs the characteristic function described un
38. s are of the right size and pressure rating is extremely important for the gaskets to be of the right size to adapt to the flanges and that the valve inlet and outlet remain perfectly unobstructed The gaskets sealing surfaces and hardware must be of the right pressure and temperature rating Please also bear in mind the following points a Mount the inlet gasket if present to the manifold flange Check it is clean etc Where possible use the flange studs to adapt the valve to the flange Oil the studs with a suitable lubricant b When mounting flanged valves tighten the nuts of the bolts uniformly to prevent distortion misalignment and imperfect seals c After the valve has been positioned correctly mount the nuts and tighten by hand Then tighten each one little by little As an extra precaution while tightening the bolts check the distance between the two flanges to make sure they remain parallel while being tightened against one another Use a compass gauge to do this Then carry out a general check to make sure that all the above requirements have been satisfied d Now mount the outlet pipe First carefully check all the parts to make sure they are perfectly clean Lubricate the bolts e Mount the nuts on the outlet gasket Tighten them by hand and then proceed as indicated in point c After checking the valve has been correctly mounted connect the valve body drain pipe This pipe must also be perfectly flexible so
39. s to the supplier manufacturer together with a description of the problem 23 2 In order to receive spare parts or information always quote the series number shown on the rating plate attached to the valve or punched on the outer surface of the flanges 233 Rating plate example Type of valve Series n CARRARO 1 102 269912 1 A ATTENTION The external adjustment devices of all safety valves are sealed Immediately prior to delivery the valves are sealed by CARRARO or the control body These seals must be applied so that the valves cannot be adjusted without breaking them The unauthorised breakage of seals will make the guarantee null and void When ordering spare parts always quote the series number punched on the rating plate attached to the valve CARRARO S R L 20090 SEGRATE MD via E Fermi E MAIL info carrarovalvole it Rev 1 12 07 02 VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452
40. sees fit Under no circumstances may users require modifications or improvements to be made to valves that have already been delivered 2 GUARANTEE The scope and duration of the guarantee are indicated in the manufacturer s General Conditions of Sale The applicable conditions are those that were in force at the moment of delivery Amongst other things the guarantee does not cover damage to valves deriving from the following Ignorance or non observance of these operating instructions Insufficiently trained fitters operators or maintenance men Normal wear and tear Incorrect or negligent use of the valves The manufacturer declines all liability for the following which are not covered by the guarantee Non observance of accident prevention regulations and or safety legislation Incorrect assembly start up or use Improper or incorrect use inappropriate use or different working conditions from those agreed Users are solely liable for physical injury and or damage to property if the above is not observed 3 VALIDITY OF INSTRUCTIONS These instructions refer to the following types of safety valves CS 30 with open frame not sealed Flanged Fig 1 or threaded Fig 2 The CS 30 valves are always fitted with a lever and a disc with a metal or resilient gasket CS 31 with closed frame sealed Flanged with lever Fig 3 or without lever Fig 4 Threaded with lever Fig 5 or without lever Fig 6
41. starting to dismount it CAUTION Take care when examining a safety valve for leaks Before operating a valve make sure no one is in the vicinities Even small quantities of steam escaping during operation may cause serious injury to people Wear suitable protection equipmentin order to prevent injury When operating a safety valve for the first time or after servicing always be ready to release it with the lever remaining at a distance ina sheltered place This can be done by pulling the lever with a suitably fixed piece of wire Hitting a pressurised valve may cause it to release too early Never hit a valve when the pressure of the system is near the calibration pressure of the valve Mark all possible discharge or Please consult CARRARO before working on valve parts leak points in order to prevent serious injury or death CARRARO S R L 20090 SEGRATE MI via E Fermi e e e E MAIL info carrarovalvole it Rev 1 12 07 02 VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 7 SAFETY VALVE TERMINOLOGY 1 Counterpressure Counterpressure is the static pressure at the outlet of a safety device caused by the pressure existing or formed in the discharge system 2 Pressure drop blow down This is the difference between the effective pop opening pressure of a valve and the e
42. tallation or adjustments 16 1 Fluid leaks 16 1 1 Fluid leaks in valves with lifting lever type CS 30 Normal operating pressure must always be at least 10 lower than calibration pressure otherwise the sealing force exercised by the spring on the disc will be so weak that a slight pressure peak is sufficient to cause a leak If there is a very slight leak of fluid a hissing sound can be heard when the pressure has almost reached the opening point this is not a problem but just indicates that the sealing surfaces of the seats are slightly irregular A larger leak instead indicates that the seat is damaged Continuous leakage may also occur at normal operating pressure which is considerably lower than the closing pressure of the valve These leaks may be caused by deposits of foreign bodies damaging the seats Discharge the valve a few times using the manual opening lever 19 If this does not eliminate the problem get the valve repaired as soon as possible in order to prevent the seat from being seriously eroded Leaks can sometimes be caused by mechanical problems such as insufficient play between the nut 16 and the lever 19 deformation of the valve body due to the incorrect installation of the outlet pipe both of which exert harmful stress on the valve 16 1 2 Fluid leaks in valves with airtight lifting lever type CS 31 Figs 3 5 The contents of paragraph 14 1 1 referring to 20 for the lever and 15 for the nut Figs 3 and
43. terpressure as established by ISPESL regulations paragraph 1 0 2 point 11 3 If the temperature is different from ambient temperature recalibrate the valve to real operating conditions ATTENTION Before calibrating the valve make sure that the operating pressure is less than the blow down pressure so that the valve is completely closed CARR ARO S R L 20090 SEGRATE MI via E Fermi IMIOO27E doc 29 E MAIL info carrarovalvole it Rev 1 12 07 02 VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 14 CALIBRATION 14 1 Calibrating safety valves with lifting lever type CS 30 Figs 1 2 To adjust calibration pressure proceed as follows Remove the seal if present and the split pin on the lever pin Pull out the lever pin 15 and the lever 19 Unscrew the screw from the cap 20 Loosen the lock nut 14 and turn the calibration screw 13 clockwise to increase calibration pressure and anti clockwise to decrease calibration pressure Tighten the lock nut 14 and reassemble the various pieces Make sure the lever 19 does not push against the nut 16 play between the two parts must be about 1 5 mm ZS 14 2 Calibrating safety valves with airtight lifting lever type CS 31 Figs 3 5 To adjust calibration pressure proceed as follows Remove the seal if present and the pin 18
44. the rod washers spring assembly making sure that the two half rings 24 are firmly fitted in their seat Mount the disc 4 on the rod 10 Screw the seat assembly into the frame 8 and secure it Tighten the calibration screw 13 until all play has been eliminated and add the same number of turns used to lift the screw when the valve was dismounted Tighten the lock nut 12 and reassemble the cap until it comes to rest against the gasket Move the adjusting ring 3 to its original position as follows Use a sharp tool to slowly turn the ring to the right until it touches the disc holder 4 Turn the ring to the left counting the same number of notches previously counted when dismounting the valve in order to return it to its original position Tighten the reference screw 25 and put back the seal if present 2 22 4 Checking the gaskets When reassembling check the existing gaskets are in perfect working order and replace if necessary N ATTENTION When welding piping do not attach the earth connector to the valve as this may damage important sliding parts CARRARO S R L 20090 SEGRATE MD via E Fermi E MAIL info carrarovalvole it Rev 1 12 07 02 VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 23 REPAIRS 23 1 If it is not possible to eliminate the problems send faulty valve
45. ull out the screw 20 and remove the 18 Release the lock nut 17 and remove from the rod 10 Unscrew the nut 16 Remove the seal if present and unscrew the lock nut 21 Turn the adjusting ring 3 to the right until its touches the disc 4 Count and write down the number of notches the ring was moved by as it must be returned to its initial position when reassembling it Loosen the lock nut 14 and unscrew the calibration screw 13 anti clockwise counting the number of turns before the spring is completely released Tighten the valve body in a clamp and loosen the connection between the valve body and the frame only using a belt wrench never use pipe wrenches or any other plumber s wrench as these could damage the frame Unscrew and remove the frame from the valve body Remove the disc 4a and disc holder 4 Pull out the rod washers spring assembly Take care to lose the two half rings 5 as they may leave their seat when the spring is released Remove the adjusting ring 3 from the seat assembly 1 Fig 1 or 22 Fig 2 CARRARO S R L 20090 SEGRATE MI via E Fermi e e e E MAIL info carrarovalvole it Rev 1 12 07 02 VALVES AND INSTRUMENTS TEL 02 269912 1 FAX 02 2692 2452 INSTRUCTIONS For installing and servicing safety spring valves series CS types 30 31 20 2 Dismounting safety valves with airtight lifting lever type CS 31 Figs 3 5 Remove t
46. were not connected to the outlet line by a curve 1 discharged horizontally this force would continue throughout the 5 cycle would be equivalent to FR After stabilising the flow Fig 3 the impact of the fluid on the outlet curve cancels the force FF and the fluid flows up towards the outlet a downward force FR is created along the centre line of the outlet curve This force associated with the arm L produces a bending moment in the valve collar It also produces an unbalanced downward force on the manifold if present to which the valve is connected this force must be compensated by the spring bracket or another system The force FR is given by the equation FR 10 3600 A outlet area rate of flow in mass Kg h P static pressure bar V speed m s In addition to the effective flow of the valve the reaction force values are based on pressure temperature and valve configuration When developing the table we presumed that the valves discharged into an open system such as the atmosphere or curves with a drip collector Therefore for valves which discharge into a closed area or outlet lines with fixed pipes variations in the reaction forces and the effects on nozzles manifolds and outlet lines must be considered Fig 3 Valve open flow The values of the forces indicated refer to valves installed according stabilised at full to this CARRARO use and m
47. y spring valves series CS types 30 31 gmi 11 6 10 i2 9 8 8 p LA CY 6 SAE E Fig 5 Valvolatipo CS 31 Con leva Fig 6 Valvolatipo CS 31 Senzaleva CS 31 type valve With lever CS 31 type valve Without lever 1 Corpo Sede Nozzle body 18 Pernoleva Leverpin 2 Guarnizione Gasket 19 Albero comando Control shaft PART A TAPPI A TENUTA ELASTICA Anello regolaz Adjusting ring 20 Leva Lever RESILIENT TIGHTNESS DISC 4 Portatappo Holder 21 Guarnizione Gasket 4a Tappo Disc 22 Guarnizione Gasket 5 Tuboeiettore Eductortube 23 Guida Guide Per orifici tipo 6 Pistone Piston 24 Anelloperasta Stemring 7 Piattello infer Lower washer 25 Vite anello regolazione E a 8 Incastellatura Bonnet Adjusting ring pin 9 Molla Spring 26 Guarnizione Gasket 10 Asta Stem 27 Cappello Cap 11 Piattello superiore Upperwasher 28 Tappo Disc 12 Controdado Lock nut 29 Viteguarniz Gasket screw 13 Viteditaratura Compression screw 30 Guarnizione Gasket 14 Cappello Cap 31 Tappo Disc 15 Dadoperasta Stem nut 32 Vite Screw Per orifici tipo 16 Dado Nut 33 Piattelloguarnizione Gasket plate For orifice type 17 Manicotto Sleeve 34 Guarnizione Gasket G H J 35 Sigillo RICAMBI CONSIGLIATI R
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