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.
2-2.1.31
Page 3
FIGURE 2
MODEL A-1 DRY PIPE VALVE
OPERATION
LIFTING
SHUT OFF
FROM SYSTEM
FROM
WATER SUPPLY
VALVE IN OPERATED POSITION
DRAIN
(AFTER MAIN CONTROL
VALVE IS CLOSED)
VALVE IN DRAIN POSITION
WATER SUPPLY
FIRST
PORT
DRAIN
MAIN
2" NPT
LATCH
POSITION
PORT
PRESSURE
1/2" NPT
WATER
SUPPLY
LUGS
LATCH
SECOND
POSITION
(LATCHED)
CLAPPER
ASSEMBLY
CLAPPER
ALARM PORT
(WATERFLOW
TO ALARM)
(FULLY
LATCH
WATERFLOW
OPEN)
UP
TO SYSTEM
WATER SUPPLY
TO SYSTEM
VALVE IN SET POSITION
AIR PRESSURE
WATERFLOW
FROM
SEAT
SEAT
WATER
AIR
FILL PORT
PRIMING
3/4" NPT
AIR SUPPLY
PORT
3/4" NPT
CHAMBER
INTERMEDIATE
3/4" NPT
(OPEN TO
ATMOSPHERE)
ALARM PORT
PRIMING
ASSEMBLY
CLAPPER
LEVEL
2A
2B
2C
FIGURE 3
MODEL A-1 DRY PIPE VALVE
4 INCH (DN100) FRICTION LOSS
100 200 1000600400
500020001000
0.200
0.040
0.010
0.020
0.080
0.100
0.400
0.600
0.060
0.008
1500
600400
NOMINAL PRESSURE DROP IN POUNDS PER SQUARE INCH (PSI)
4.0
0.1
0.2
0.6
0.4
1.0
0.8
2.0
6.0
10.0
8.0
FLOW RATE IN GALLONS PER MINUTE (GPM)
(1 GPM = 3.785 LPM)
FLOW RATE IN LITRES PER MINUTE (LPM)
NOMINAL PRESSURE DROP IN BAR
(1 PSI = 0.06895 BAR)
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