Mounting and operating instructions EB 2623-2 EN
Contents
1. especially in district heat ing systems and large heating networks to maintain the upstream pressure at the ad justed set point The Types 44 7 and 44 8 Excess Pressure Valves consist of the valve body with bal anced valve plug and integrated actuator containing a diaphragm and spring assem bly Type 44 8 is a safety excess pressure valve SEV and therefore equipped with a sec ond operating diaphragm If the first dia phragm fails the second permits continued operation When the upstream pressure ex ceeds a given limit the pressure regulator works as a safety valve by opening the valve to relieve the pressure The medium flows through the valve in the direction indicated by the arrow on the body The upstream pressure excess pres sure to be controlled is transferred through the internal hole in the body 12 to the operating diaphragm 6 and is converted info a positioning force This positioning force is used to move the valve plug depend ing on the force of the spring assembly Turn the set point adjuster 9 to change the spring force and consequently the set point The valve opens when the upstream pres sure Increases 4 EB 2623 2 EN Typetest The pressure regulator has been typetested as a safety excess pressure valve by the German technical surveillance association TUV The test mark is available on request Tightening torques Plug section ltem13 Screws Valve body Seat2. Excess Pressure Valve Type 44 7 and Type 44 8 SEV Fig 1 Type 44 8 Safety Excess Pressure Valve Mounting and operating instructions EB 2623 2 EN Edition December 2002 Contents Contents 1 Design and principle of operation 2 Installation 2 1 Mounting position 2 2 SPONSI a oak a aa ern 2 3 Additional mounting instructions 3 Operation 3 1 Start up and set point adjustment 4 Maintenance exchanging parts 4 1 Cleaning or exchanging the plug 4 2 Exchanging the diaphragm 5 Customer inquiries 6 Dimensions in mm and weights 2 EB 2623 2 EN Safety instructions General safety instructions The regulators may only be mounted started up or serviced by fully trained and qualified personnel observing the accepted industry codes and practices Make sure employees or third persons are not exposed to any danger All safety instructions and warnings in these mounting and operating instruc tions particularly those concerning assembly start up and maintenance must be observed The pressure regulators fulfil the requirements of the European Pressure Equip ment Directive 97 23 EC Valves with a CE marking have a declaration of conformity which includes information about the applied conformity assess ment procedure The declaration can be viewed and downloaded on the Inter net at hito www samson de For appropriate operation make sure that the regulators are only used i
3. Plug Diaphragm plate Nut Operating diaphragm 2nd operating diaphragm Diaphragm case Operating springls Set point adjuster Intermediate ring Diaphragm rupture indicator order no 1180 8315 Internal hole in body Screws 1 2 3 A 5 6 6 7 8 9 1 1 Caution The spring assembly 8 is pretensioned up to 180 mm Only disassemble the spring s using a special tool e g SAMSON device 9129 2747 v4 Fig 2 Sectional drawing TS Design and principle of operation 10 1 5 2 N a N Qu amp I m IS MT SPIN WE Diaphragm rup SLE ture indication at approx 1 5 bar 6 1 Z LLLL L Sp Type 44 7 H Type 44 8 SEV EB 2623 2EN 5 Installation 2 Installation 2 1 Mounting position The excess pressure valves must be installed in horizontal pipelines with the actuator in cluding the spring assembly suspended downwards Use the supplied screw joints for connec tion Make sure the direction of flow corre sponds to the arrow on the body 2 2 Strainer Install a strainer SAMSON Type INI up stream of the excess pressure valve to pre vent that any sealing parts globules and other impurities carried along by the pro cess medium impair the proper functioning of the valve above all the tight shut off Install the strainer so that the direction of flow corresponds to the arrow on the body The filter element must be vertically sus pended Remember to leave enough
4. e excess pres sure valve make sure the relevant section of the pipeline is depress urized and depending on the me dium drained as well For high temperatures allow the plant to cool down to ambient tem perature before you start It is recommended to remove the ex cess pressure valve from the pipeline If the upstream pressure drops considerably after all consumers have been disconnected the valve fails to close tightly This may be caused by a contaminated seat and plug or when the valve has become untight due fo natural wear If external leakage occurs at the actuator body or if the upstream pressure increases suddenly check the operating diaphragm and replace it if necessary Only for Type 44 8 2 diaphragms The safety excess presure valve has a hole in the intermediate ring 10 containing either a mechanical rupture indicator acti vated at approx 1 5 bar or a pressure switch When the lower diaphragm 6 1 fails the pressure in the chamber between the two diaphragms increases until it reaches the value of the upstream pressure The mechanical rupture indicator shows a red marking In case a pressure switch is used a diaphragm rupture can be indi Maintenance exchanging parts cated either visually or acoustically by an appropriate signal If a rupture is indicated replace the dia phragm 6 1 4 1 Cleaning or exchanging the plug 1 Remove the regulator from the pipeline 2 Remove screw
5. n areas where the operating pressure and temperatures do not exceed the oper ating values which are based on the valve sizing data submitted in the order The manufacturer does not assume any responsibility for damage caused by external forces or any other external influence Any hazards which could be caused in the pressure regulator by the process medium the operating pressure or by moving parts are to be prevented by means of the appropriate measures Proper shipping and appropriate storage are assumed Caution When removing the regulators from the plant make sure the relevant section of the pipeline is depressurized and depending on the process medium drained as well If necessary allow the valve to cool down or heat up to reach ambient temperature prior to starting any work on the regulator Allow the plant to fill up slowly on start up On pressurizing the plant to carry out a pressure test make sure the dia phragm actuator is not damaged by the test pressure The maximum permissible pressure in the actuator must not be exceeded Make sure the pressure regulators are frost protected when they are used to control freezing process media e g water If the regulator is installed in loca tions subject to frost it must be removed from the pipeline when it is not oper ated EB 2623 2EN 3 Design and principle of operation 1 Design and principle of oper ation The excess pressure valves and safety valves are used
6. s 13 and the actuator For sizes DN 15 to 25 unscrew the guide nipple of the plug section 3 using a socket wrench order no 1280 3001 and remove it This wrench can also be made from for example a Gedore screwdriver bit IN 19 19 by boring a 17 mm hole 17 into the 19 mm hexagon bit For DN 32 to 50 unscrew the screw plug before removing the plug section 3 Thoroughly clean the seat and plug section Check whether the flow can pass properly through the internal hole in the body 12 If he plug is damaged replace the co plete plug section 19 mm hexagon bit Fig 4 Socket wrench EB 2623 2EN 7 Maintenance exchanging parts 4 For reassembly proceed in reverse order Observe tightening torques as specitied in the table in Fig 2 4 2 Exchanging the diaphragm 1 Remove the regulator from the pipeline 2 Remove the springs 8 using a suitable tool e g SAMSON device 9129 2747 Caution Springs 8 are pretensioned up to 180 mm 3 Remove screws 13 and the actuator 4 Unscrew nut 5 and lift off the dia phragm plate 4 For Type 44 8 addi tionally remove the intermediate ring 10 5 Exchange the diaphragm s 6 For reassembly proceed in reverse order Observe tightening torques as specitied in the table in Fig 2 8 EB 2623 2 EN 5 Customer inquiries If you have any questions regarding the ex cess pressure valve please submit the fol lowing details Valve t
7. space to remove it 1 Hand operated shut off valve 2 Pressure gauge upstream pressure 3 Strainer A Excess pressure valve 5 Pressure gauge downstream pressure Fig 3 Installation example 6 EB 2623 2 EN 2 3 Additional mounting instruc tions We recommend to install a hand operated shut off valve both upstream of the strainer and downstream of the regulator to be able to shut down the plant for cleaning and when working on the regulator In addition this relieves the operating diaphragms when the plant is not used for longer periods of time To monitor the pressures in the plant install a pressure gauge both upstream and down stream of the regulator 3 Operation 3 1 Start up and set point adjust ment First open the shut off valve downstream of the excess pressure valve Then slowly open the shut off valve upstream of the excess pressure valve Adjust desired upstream pressure excess pressure as set point using the set point adjuster 9 at the spring plate Watch upstream pressure gauge during adjust ment Turn clockwise to increase the set point and counterclockwise to reduce it For decommissioning first close shut off valve upstream of the regulator then close shut off valve downstream of the regulator 4 Maintenance exchanging parts The valve is subject to natural wear Depending on the operating conditions it must be checked at regular intervals Caution When working on th
8. ype and nominal size Product and order number as specified on the nameplate Pressure upstream and downstream of the valve Flow rate in m3 h Has a strainer been installed Installation drawing Dimensions in mm and weights 6 Dimensions in mm and weights Node m I m Is 10 mas as me m a a e T Width across flats SW Length L L1 with weld on fittings Type 44 7 Type 44 8 Height H Weohinie Avpox 20 21 a 83 I 9 I os a E Special versions With threaded ends male thread Tee S S lt lt S S SSSSST 1 273 for set point range 6 to 11 bar 32 45 lt A Version with Version with threaded ends flanges Values in apply for DN 32 50 116 160 Version with weld on fittings EB 2623 2EN 9 SAMSON AG MESS UND REGELTECHNIK Weism llerstra e 3 60314 Frankfurt am Main Germany Phone 49 69 4009 0 Fax 49 69 4009 1507 Internet http www samson de EB 2623 2 EN S Z 2003 03
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