INSTALLATION
The Model A-1 Dry Pipe Valve must be installed in accord-
ance with the following instructions.
NOTES
Proper operation of the Model A-1 Dry Pipe Valve de-
pends upon its trim being installed in accordance with the
instructions given in this Technical Data Sheet. Failure to
follow the appropriate trim diagram may prevent the
Model A-1 Dry Pipe Valve from functioning properly, as
well as void listings, approvals, and the manufacturer’s
warranties.
1. All nipples, fittings, and devices must be clean and free
of scale and burrs before installation. Use pipe thread
sealant sparingly on male pipe threads only.
2. The Model A-1 Dry Pipe Valve must be trimmed in ac-
cordance with Figures 4 and 5.
3. Care must be taken to make sure that check valves,
strainers, globe valves, etc. are installed with the flow ar-
rows in the proper direction.
4. Drainage to the drip funnel must be installed so as to not
restrict flow.
5. Suitable provision must be made for disposal of drain
water. Drainage water must be directed such that it will
not cause accidental damage to property or danger to
persons.
6. The Pressure Relief Valve must be set to relieve at a
STAR SPRINKLER INC.
2-2.1.41
Page 3
FIGURE 2
MODEL A-1 DRY PIPE VALVE
OPERATION
(FULLY
VALVE IN OPERATED POSITION
VALVE IN DRAIN POSITION
WATER SUPPLY SHUT OFF
LATCH
MAIN
2" NPT
POSITION
PORT
DRAIN
(AFTER MAIN CONTROL
VALVE IS CLOSED)
1/2" NPT
WATER
SUPPLY
PORT
PRESSURE
FIRST
LATCH
SECOND
POSITION
DRAIN FROM SYSTEM
FROM WATER SUPPLY
(LATCHED)
CLAPPER
ASSEMBLY
TO ALARM)
LATCH
CLAPPER
WATERFLOW
ALARM PORT
(WATERFLOW
OPEN)
UP
AIR PRESSURE TO SYSTEM
AIR SUPPLY
PRIMING
3/4" NPT
PORT
SEAT
AIR
FILL PORT
SEAT
WATER
LIFTING
LUGS
VALVE IN SET POSITION
WATERFLOW TO SYSTEM
FROM WATER SUPPLY
3/4" NPT
3/4" NPT
ATMOSPHERE)
ASSEMBLY
CLAPPER
(OPEN TO
ALARM PORT
INTERMEDIATE
CHAMBER
LEVEL
PRIMING
2A
2B
2C
FIGURE 3
MODEL A-1 DRY PIPE VALVE
6 INCH (DN150) FRICTION LOSS
2000 3000600 1000200 400
20001000 4000 10000
FLOW RATE IN GALLONS PER MINUTE (GPM)
NOMINAL PRESSURE DROP IN BAR
(1 PSI = 0.06895 BAR)
FLOW RATE IN LITRES PER MINUTE (LPM)
(1 GPM = 3.785 LPM)
0.008
0.010
0.020
0.080
0.040
0.060
0.100
0.200
0.400
0.600
0.1
NOMINAL PRESSURE DROP IN POUNDS PER SQUARE INCH (PSI)
4.0
0.2
0.6
0.4
1.0
0.8
2.0
6.0
10.0
8.0
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