Fig. 28 - Gate Valves - Bronze
Contents
1. Mllattersley Quatity RELIABILITY amp Service ASSURED Document No 004B00028D799 rev 1 Engineering Data Sheet Page of 4 Installation Operation amp Maintenance Instructions for Date 14 February 2002 Fig 28 Bronze Gate Valves Lever Operated Hattersley Newman Hender Lid 2002 CE MARKING AND THE PRESSURE EQUIPMENT DIRECTIVE 97 23 EC This has been implemented in United Kingdom law by the Pressure Equipment Regulations 1999 SI 1999 2001 The regulations apply to all valves with a maximum allowable pressure greater than 0 5 bar Valves with a maximum allowable pressure not exceeding 0 5 bar are outside the scope of the Directive Valves are categorised in accordance with the maximum working pressure size and ascending level of hazard which is dependent on the fluid being transported Fluids are classified as Group 1 dangerous fluids or Group 2 all other fluids including steam Categories are SEP sound engineering practice and for ascending levels of hazard Il Ill or IV All valves designated as SEP do not bear the CE mark nor require a Declaration of Conformity Categories Il Ill or IV carry the CE mark and require a Declaration of Conformity Note all valves up to and including 25mm 1 having a maximum allowable pressure greater than 0 5 bar are designated SEP regardless of fluid group PRODUCT LIFE CYCLE The life of the valve is dependent on its application frequency of use and freedom from misuse Compatibil2. is re pressurized check for leak tightness and further adjust the gland as necessary For the supply of genuine Hattersley spares technical assistance or Hattersley ValveServe contact Hattersley Newman Hender Limited England Telephone 01695 577199 Facsimile 01695 578775 Email uksales hattersley com export hattersley com Service Freephone 0500 618205
3. ity with the system into which it is installed must be considered The properties of the fluid being transported such as pressure temperature and the nature of the fluid must be taken into account to minimise or avoid premature failure or non operability A well designed system will take into consideration all the factors considered in the valve design but additionally electrolytic interaction between dissimilar metals in the valve and the system must be examined Before commissioning a system it should be flushed to eliminate debris and chemically cleaned as appropriate to eliminate contamination all of which will prolong the life of the valve LIMITS OF USE The valves to which these installation operation and maintenance instructions apply have been categorised in accordance with the Pressure Equipment Directive The fluid to be transported is limited to Group 2 liquids i e non hazardous and on no account must these valves be used on any Group 2 gases Group 1 liquids or Group 1 Gases Fig 28 lever operated gate valve at 8 6 bar maximum pressure and in sizes up to and including 3 inch are categorised as SEP and do not require the CE mark Operating pressures and temperatures PN Non shock pressure at Non shock pressure at temperature range max temperature 8 6 8 6 bar from 10 C to 40 C 4 bar at 150 C Not suitable for fatigue loading creep conditions fire testing fire hazard environment corrosive or erosive
4. l pipework Fig 28 valves must be fitted with hexagon cap uppermost above the valve In the interests of safety valves installed on end of line service in the closed position should be fitted with a blanking plug on the downstream end connection of the valve INSTALLATION Prior to installation a check of the identification plate and body marking must be made to ensure that the correct valve is being installed Valves are precision manufactured items and as such should not be subjected to misuse such as careless handling allowing dirt to enter the valve through the end ports lack of cleaning both valve and system before operation and excessive force during handwheel operation All special packaging material must be removed Confirm that the pipe threading length is correct to avoid excessive penetration of the pipe into the valve which would otherwise cause damage Thread sealing compounds appropriate to the application must be used but excessive use should be avoided since this increases thread interference and may cause overstressing of the body ends Ensure the threads are properly engaged and proceed to tighten the valve onto the pipe The wrench must only be located on the valve end into which the pipe is being threaded to avoid distortion of the valve Immediately prior to valve installation the pipework to which the valve is to be fastened should be checked for cleanliness and freedom from debris After installation the valve
5. may be opened and closed fully to confirm satisfactory operation Mllattersley Quatity RELIABILITY amp Service ASSURED Document No 004B00028D799 rev 1 Engineering Data Sheet Page 3 of 4 Installation Operation amp Maintenance Instructions for Date 14 February 2002 Fig 28 Bronze Gate Valves Lever Operated Hattersley Newman Hender Lid 2002 OPERATION The Fig 28 gate valve is operated via a lever fitted to the wedge hinge pin assembly To open the valve the lever is rotated clockwise No further effort is necessary when fully open To close the valve rotate the lever anti clockwise until a positive stop is felt Wheelkeys or other similar devices should not be used Note When the valve is closed at extreme high temperature and then cooled the wedge may become tight in the valve and prove difficult to open Conversely a valve closed at room temperature can be difficult to open if there is an increase in fluid temperature causing a linear expansion of the pipe which tightens the wedge in the body The operator should use suitable hand protection at extreme temperature conditions Gate valves should only be used in the open or closed position MAINTENANCE The valve should be at zero pressure and ambient temperature prior to any maintenance Maintenance Engineers amp Operators are reminded to use correct fitting tools and equipment A full risk assessment and methodology statement must be compiled prior to any mai
6. ntenance The risk assessment must take into account the possibility of the limits of use being exceeded whereby a potential hazard could result A maintenance programme should therefore include checks on the development of unforeseen conditions which could lead to failure These gate valves should not normally require any maintenance however in the event of maintenance being necessary the following procedure should be followed GLAND ADJUSTMENT 1 Carefully tighten the gland nut 2 Ifthe gland nut becomes solid and the gland is still leaking This indicates that the gland needs re packing GLAND PACKING REPLACEMENT 1 Before commencing work de pressurize the system 2 Slacken the lever nut and remove the lever 3 Remove the gland nut 4 Using a sharp pointed tool lift out the existing packing and ensure the stem and stuffing box are clean amp free from debris Take care not to damage the stem or stuffing box 5 Fit new Hattersley packing into the stuffing box and press down firmly Slattersley Quatity RELIABILITY amp Service ASSURED Document No 004B00028D799 rev 1 Engineering Data Sheet Page 4 of 4 Installation Operation amp Maintenance Instructions for Date 14 February 2002 Fig 28 Bronze Gate Valves Lever Operated Hattersley Newman Hender Lid 2002 6 Re fit the gland nut 7 Re fit the lever and nut 8 Tighten the gland and confirm stem resistance while operating the valve When the valve
7. service transporting fluids with abrasive solids PRESSURE TEMPERATURE RATING These valves are suitable for 8 6 bar rating and they must be installed in a piping system where the normal pressure and temperature do not exceed this rating If system testing will subject the valve to pressures in excess of the working pressure rating this should be within the test pressure for the body with the valve Mllattersley Quatity RELIABILITY amp Service ASSURED Document No 004B00028D799 rev 1 Engineering Data Sheet Page 2 of 4 Installation Operation amp Maintenance Instructions for Date 14 February 2002 Fig 28 Bronze Gate Valves Lever Operated Hattersley Newman Hender Lid 2002 The maximum allowable pressure in valves as specified in the standards is for non shock conditions Water hammer and impact for example should be avoided If the limits of use specified in these instructions are exceeded or if the valve is used on applications for which it was not designed a potential hazard could result LAYOUT AND SITING It should be considered at the design stage where valves will be located to give access for operation adjustment maintenance and repair Valves must be provided with adequate support Adjoining pipework must be supported to avoid the imposition of pipeline strains on the valve body which would impair its performance Fig 28 Gate valves may be installed in Horizontal and vertical pipework Note For horizonta
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