Fig.425 Pressure Reducing Valve (PRV)
Contents
1. the upper part of the valve this may be due to damage to the seat seal and or sleeve Remedial action Restore correct operation of the valve by replacing the valve insert If water discharges at the spring bonnet this may be because it is not screwed on tightly enough c Scale furring The distance to the non return valve must be such that no hot water can be applied to the PRV even in the event of the fitting leaking If you do not apply this rule during the installation there is a risk of the PRV scaling Remedial action Correct the installation arrangement If this is not possible you must replace the complete valve insert regularly PRESSURE REDUCING VALVE PRV2. INSTALLATION AND OPERATING INSTRUCTIONS W R A S 9 A arttersSiey APRO R PRESSURE REDUCING VALVE PRV FIG 425 PN25 Nilattersley PO BOX 719 IPSWICH IP1 9DU FM311 ISO 9001 Designed and manufactured under quality HOME SALES 44 0 1744 458670 management systems in accordance with EXPORT SALES 44 0 1744 458671 BS EN ISO 9001 2008 gt TECHNICAL HELPLINE 0845 604 1790 8 Every effort has been made to ensure that the a FAX 44 0 1744 26912 information contained in this publication is accurate at a EMAIL uksales hattersley com the time of publishing Hilo assumes no z 3 responsibility or liability for typographical errors or Og EMAIL exportsales hattersley com omissions or for any misinterpretation of the gt S information within the publication and reserves as www hattersley com the right to change without notice r O CRANE VNK CRANE VNS www cranebsu com GENERAL NOTES OF SAFETY INSTALLATION AND ADJUSTMENT 1 The PRV must only be used The PRV is pre set to an outlet pressure of 3 bar and is to be installed for the specified purpose in the pipe without applying stress to the connections e if it is in satisfactory condition e whilst taking the necessary safety and hazard precautions 2 Always read the installation instructions 3 The PRV must only be installed in accordance with the operating pressure and temperature stated on the product The manufacturer shall not be responsible for damage cause
3. UTION When carrying out maintenance on the PRV the valve should be isolated and the system pressure should be removed REPLACING THE VALVE INSERT Remove plastic protective cap loosen lock nut Relieve spring tension by turning the setting spindle counter clockwise Unscrew spring housing spring plate settling spindle copper ring and spring By means of 2 screwdrivers lever out the complete valve insert fig 1 and replace with a new one fig 2 Installation is carried out in reverse order CLEANING THE STRAINER Unscrew and remove valve insert see previous section fig 1 The strainer can be pulled off and cleaned after removing the bottom O ring from the valve insert After cleaning slide strainer over the valve insert and insert O ring back in the provided groove Assemble complete valve insert Installation is carried out in reverse order fig 2 PRESSURE REDUCING VALVE PRV INSTALLATION AND OPERATING INSTRUCTIONS CAUSE OF FAULTS REMEDIAL ACTION a Pressure gauge indicates pressure increase The non return valve installed between PRV and water heater may be leaking which during the heating process of the boiler leads to the expanding water of the boiler causing a rise in secondary pressure at the pressure gauge although the pressure reducer is operating correctly Remedial action Replace non return valve b Damage to seat seal or sleeve If the outlet pressure of the PRV increases or water discharges at
4. d by external influences 4 Installation must be carried out by a qualified individual The flow direction must coincide with the arrow on the valve body The valve can be installed in any mounting position The pipe should be thoroughly flushed prior to installation of the PRV to prevent small particles entering and damaging the internal components A pressure gauge can be screwed into one of the sockets to indicate the outlet pressure The desired outlet pressure is set by turning the adjusting spindle at idle pressure zero flow Turning the adjusting spindle in a clockwise direction increases the outlet pressure and turning the spindle in a counter clockwise direction TECHNICAL reduces the outlet pressure Size Va 34 1 1 1 4 1 1 2 D Note Set pressure reduces as outlets are opened Length mm 135 160 180 195 225 255 Weight in Kg 1 2 1 3 2 4 2 6 55 6 0 CAUTION Before commissioning the PRV it should be ensured that both pressure gauge connections on the valve body are sealed with Field of use Water l inet Pressure Up to 25 bar pressure gauges or sealing plugs Outlet range 1 to 8 bar Materials Bronze End Connections Male tapered BSEN 10226 2 Temperature range Up to 80 C WRAS max PRESSURE REDUCING VALVE PRV PRESSURE REDUCING VALVE PRV i MAINTENANCE The PRV should be regularly inspected in accordance with BSEN 1567 After long periods of inactivity the valve must be tested CA
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