GW DRY PIPE VALVE INSTALLATION & OPERATION 100mm (4 ) 150mm (6 )

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1 Read in conjunction with Dry Valve Set Schematic (section 7). 1. PRINCIPLE OF OPERATION. Primary functions of the Angus Type D dry alarm valve station: 1.1. To maintain a dry sprinkler pipework system by preventing water under pressure from entering the sprinkler system. The Model D Dry Pipe Valve is maintained in the closed position, while the air pressure in the system piping above the Dry Pipe Valve is sufficient to exert a greater force on the top side of the Clapper, than is exerted on its underside by the pressure of the water supply. Since the area included by the air seat is approximately 6 times that of the water seat (the differential principle), the air pressure needed to keep the Dry Pipe Valve closed is only a fraction of that of the water supply. Table 1 below, gives the recommended air pressure for various water supply pressures for both sizes of Model D Dry Pipe Valves To allow the sprinkler system to be isolated via supply valve (1) and drained down for maintenance purposes Air supplied from a compressor (3) (or from an external air source via a pressure regulator) via a quick fill valve (4) and a non return valve (5) holds the dry alarm valve closed All ball valves shown are shown in the closed position for clarity. This does not represent their final position when the valve is in operation. Ball valves are shut when the handle is perpendicular to the pipe work When one or more automatic sprinklers operate due to fire, the air pressure in the system piping above the Dry Pipe Valve is reduced. The pressure of the water supply, by exerting a greater force, raises and rotates the Clapper to its open position permitting the water to flow to the operated sprinklers. Water also flows from the Alarm Outlet of the Dry Pipe Valve, through a non return valve (21), to a water turbine operated alarm bell (16), and to operate a pressure switch (15) to generate an electrical signal. The Model D Dry Pipe Valve can be reset quickly and easily without the use of special tools The valve also includes the facility to test the bell and pressure switch without isolating or flooding the system When an automatic sprinkler operates, the resulting reduction in air pressure is inversely proportional to the size of the dry system. The larger the system the slower the reduction in air pressure, which slows the operation of the Dry Pipe Valve 1.8. Where the delay is unacceptable an accelerator is available as an optional extra. The accelerator senses the pressure drop caused by a sprinkler head operating and causes the valve to trip in a shorter time than it would take if the system air pressure had to drop to the critical release point by exiting the open sprinkler. 1 of 5

2 Table 1: Water Pressure vs. Air Pressure for Model D Dry Pipe Valves Water Pressure in Supply Line Air Pressure to be Pumped into System Maximum Nominal Not Less Than Not More Than PSI BAR PSI BAR PSI BAR PSI BAR TO SET THE VALVE ( Operating Mode ) 2.1. Shut the main water supply valve (1) to the underside of the dry pipe valve Switch off the air compressor. Ensure there is no residual air pressure in the pipework by opening valve (7), check valve (23) is open If the valve has been tripped and water has filled the system open the main 2 drain valve (2) to drain the system completely and quickly. The pipework may also require draining from drain valves on low points of the system (remote from the valve station) Ensure that the clack is seated, open the front cover (make sure there is no water or air pressure in the valve before releasing the bolts). Ensure that the interior of the valve is clean and the valve clapper rubber is in good order. Release the clack latch allowing it to fall back on to its seat Replace cover, ensure that all cover bolts are tight and all other openings are securely closed Prime the valve until the water reaches a level corresponding with valve (14) by opening the valves (18) & (13). The water assists to form an airtight seal above the clack. Once primed, close and lock in position valves (13), (14) & (18) Ensure valve (7) is locked closed and valve (23) is locked open. Fill air into the pipe system through valve (4). Apply air pressure above the clack to the pressure shown in Table 1 this is indicated on gauge (11). Once the system is at required air pressure close valve (4) so that air can only enter the system via the 3mm orifice in the ball. Lock in position 2.8. Ensure the main drain valve (2) and bell test line valve (20) is locked closed. Open the main water supply valve (1) slowly allowing water pressure to the underside of the clack. Once fully open lock in position. The water pressure is indicated on gauge (22). Ensure that the bell test line valve (17) is locked in the open position. 2 of 5

3 2.9. Note: The annular groove under the clack [connection to alarm gong (16)] should be at atmospheric pressure when the valve is set for normal operation. This is achieved via the drain orifice (19) If an accelerator unit (9) is fitted then for installation and commissioning see separate accelerator details. Accelerator Valve Installation.doc The valve is now set. 3. TO TEST THE ALARM BELL & ALARM PRESSURE SWITCH (15) Open the lockable test valve (20) to allow water from the supply to enter the bell line. The alarm bell (16) should ring continuously and the pressure switch (15) should activate. Water will be seen to flow from the waste outlet on the alarm gong turbine housing and the drip union (19) When the test is finished close and lock the test valve (20). Water will continue to drip from the drip union (19) until the bell line is empty. Note: The pipe from the annular groove to the alarm gong is fitted with a non-return valve to stop water flowing into the dry valve during a bell test, tripping the valve accidentally and flooding the system pipe work with water. 4. TO TEST ALARM - LOW AIR PRESSURE SWITCH (6) During the test below the compressor (3) (air supply) should be left running Prior to test if an accelerator (9) is fitted close isolating valve (8) Close isolating valve (23) and open isolating valve (7). The air pressure will rapidly decay in the supply pipework and Low Air pressure switch (6) should activate When the test is finished close isolating valve (7) and allow the air pressure to build up re-setting pressure switch (6), open isolating valves (8) and (23) Observe system pressure at gauge (11) to check that the system is fully re-set. 3 of 5

4 5. TO CHECK THE DRY VALVE CLAPPER SEATING Angus Fire recommends that a Trip Test be carried out every six months (see section 4.). However some authorities may ask for opening of the dry alarm valve by movement of the clapper at specified intervals. This can be achieved as follows: 5.1. Close main isolating valve (1) and open drain valve (2) Turn off compressor (3) (or isolate system air supply). Lower the system air pressure by opening drain valve (7). When pressure has dropped to zero remove plug from lower right-hand side of valve body to drain priming water When the water has drained out then open the valve by dismounting the front cover Move clapper to full open position. Check rubber facing and valve seat 5.5. Reset valve station by following the setting procedure points 2.4 to TO TRIP TEST THE DRY ALARM VALVE STATION Testing of the valve station can be achieved as follows: 6.1. Decrease the pressure in the dry pipe system by opening the system drain valve (7) and thereby simulating a sprinkler in function. When pressure has dropped to 1/6 of water supply pressure the valve will trip and flood the dry pipe system Reset valve station by following the setting procedure points 2.1 to of 5

5 7. DRY VALVE SET SCHEMATIC ITEM * 4 * 5 6 * * 6 DESCRIPTION BUTTERFLY ISOLATION VALVE - SUPPLY 2 DRAIN - SYSTEM DRAIN COMPRESSOR BALL VALVE - 3mm RESTRICTED NON-RETURN VALVE - AIR SUPPLY PRESSURE SWITCH LOW AIR PRESSURE BALL VALVE - AIR LINE TEST BALL VALVE - OPTIONAL ACCELERATOR - OPTIONAL BALL VALVE - OPTIONAL PRESSURE GAUGE - WITH NO LOSS COUPLING Not supplied as part of Valve Station ITEM DESCRIPTION TUN DISH - PRIMING LINE BALL VALVE - PRIMING LINE BALL VALVE - PRIMING LINE DRAIN PRESSURE SWITCH - SYSTEM OPERATED WATER TURBINE AND GONG - OPTIONAL BALL VALVE ISOLATE BELL TEST LINE BALL VALVE PRIMING LINE DRAIN DRIP UNION 3mm ORIFICE BALL VALVE - BELL TEST LINE NON-RETURN VALVE PRESSURE GAUGE - WITH NO LOSS COUPLING BALL VALVE - AIR LINE TEST OUTLET TO INSTALLATION of 5

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