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Servicing Main Valve
I F THE VALVE SNAP RING IS DIFFICULT TO REMOVE, RESIDUAL WATER PRESSURE MAY BE REMAINING IN THE
SYSTEM. TO PREVENT POSSIBLE SERIOUS INJURY DUE TO VALVE BEING EJECTED UPWARD UNDER
PRESSURE, CONFIRM THE FOLLOWING CONDITIONS EXIST PRIOR TO REMOVING THE SNAP RING AND VALVE.
A. WATER SUPPLY TO SPRINKLER IS SHUT OFF AT SOURCE.
B. ALL PRESSURE IS BLED FROM SYSTEM, INCLUDING CONTROL TUBES.
C. AC POWER IS DISCONNECTED AT SOURCE.
1. See Warning above. To remove valve assembly, squeeze snap ring ears together with snap ring pliers (P/N 995-100) and
remove snap ring from sprinkler body. See Figure 13.
2. Use valve removal tool P/N 995-08 for DT35 or 995-09 for
DT55 to remove valve assembly from base of sprinkler body.
Valve removal tool is inserted into sprinkler body and pushed
through valve ribs. A slight twist will catch tool under ribs
enabling valve removal by pulling straight up and out. See
Figure 14.
Note: If valve removal tool is not available, use snap ring
pliers to grasp rib of valve cylinder assembly and pull up and
out of sprinkler body.
3. Reinstall valve assembly using valve insertion tool P/N 995-76
for DT35 or 995-101 for DT55 as follows:
• Load snap ring onto insertion tool carrier with stepped side
against carrier as shown in Figure 15. While holding snap
ring in compressed position, slide retainer clip in to hold snap
ring ears
• Load valve assembly on carrier as shown.
• Locate position of communication tube in bottom of sprinkler
body and orient insertion tool accordingly.
• Insert tool straight down into sprinkler body aligning bosses on t-handle with holes on sprinkler body flange. When valve
assembly clears vertical side wall ribs inside body, pull up on snap ring release mechanism (DT55 models only) and press valve
assembly into position. Snap ring will lock into groove when properly installed. Remove insertion tool and check snap ring to
confirm that it is fully seated in groove
Figure 15
Snap Ring Release
Mechanism
WARNING
Figure 13
Snap Ring In
Retainer Clip
Stepped Side
of Snap Ring
Figure 14
Valve Assembly
Orientation In Carrier
Snap Ring
Released
Press Valve Assembly
Into Position
11
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