STAR SPRINKLER INC.
2-4.1.10
Page 3
FIGURE 3
3 INCH (DN80) MODEL A PREACTION VALVE
OPERATION AND PORT LOCATIONS
FROM WATER SUPPLY
TO SYSTEM
FROM WATER SUPPLY
TO SYSTEM
DIFFERENTIAL
VALVE SEAT
AIR
SEAT
CHAMBER
NEUTRAL
VALVE IN
OPERATED
POSITION
VALVE IN
POSITION
DIFFERENTIAL
CHAMBER
SET
W
A
TERFLOW
UP
PORT
ALARM
SEAT
WATER
CHAMBER
DIFFERENTIAL
06
ASSEMBLY
CLAPPER
04
07
05
ASSEMBLY
RESTRICTOR
LOCATED
VALVE
ON BACK OF
NEUTRAL
CHAMBER
VALVE PLUNGER
ASSEMBLY
DIFFERENTIAL
CAUTION:
LATCH
POSITION
SECOND
LATCH
CLAPPER
LATCH
FIRST
POSITION
REFER TO SETTING
PROCEDURE STEP 8
01
08
PUSH HERE TO
UNLATCH CLAPPER
02
LEVER
RETAINING
ENGAGED
CLAPPER ARM
03
WATER SUPPLY PRESSURE
DIFFERENTIAL CHAMBER SUPPLY
DIFFERENTIAL CHAMBER VENT
PORT IDENTIFICATION
MAIN DRAIN
ALARM PORT
AIR SUPPLY
RELEASING DEVICES
LOW BODY DRAIN
08
07
06
05
04
03
02
01
NO.
3/4
1/4
1/4
1/2
3/4
NPT
1/4
1-1/2
1/2
DESCRIPTION
OBSOLETE
