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Servicing Main Valve
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 7.
2. Use valve removal tool P/N 995-08 for DT34 or 995-09 for DT54
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 8.
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 DT34 or 995-101 for DT54 as follows:
• Load snap ring on insertion tool carrier with stepped side
against carrier as shown in Figure 9. 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 (DT54 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.
9
Figure 9
Snap Ring
Released
Valve Assembly
Pressed Into Position
Valve Assembly
Orientation In Carrier
Snap Ring In
Retainer Clip
Stepped Side
of Snap Ring
Figure 8Figure 7
Snap Ring Release
Mechanism
WARNING
IF 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.