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6
2600 Emrick Blvd • Bethlehem, PA 18020 • USA • 800-922-0085 • www.warrencontrols.com
SIZE
OPENING FORCE
2
2 POUNDS
4
5 POUNDS
6
15 POUNDS
8
15 POUNDS
10
20 POUNDS
12
30 POUNDS
OPENING FORCE TEST PROCEDURE
1) Remove line or tank pressure and isolate vacuum breaker.
(It is recommended that the vacuum breaker be removed from the piping or tank for the test procedure)
2) Remove capscrews from spring chamber.
3) Remove spring chamber from valve body.
4) Apply water to cover top of disc.
5) Refer to table below. Apply opening force to end of stem using dead weights. The seat must open enough that it will not
hold water applied above the disc retainer. The disc must return to contact the seat when the weight is removed.
OPENING FORCE ADJUSTMENT PROCEDURE
1) Remove line or tank pressure and isolate vacuum breaker.
(It is recommended that the vacuum breaker be removed from the piping or tank for the adjustment procedure)
2) Remove capscrews from spring chamber.
3) Remove spring chamber from valve body.
4) Loosen jamnuts on stem until disc is not in contact with seat.
5) Tighten lower jamnut against spring button until disc remains in contact with seat.
6) Apply water to cover top of disc.
7) Set spring opening force. Refer to table in Opening Force Test Procedure. Apply opening force to end of stem using dead
weights. Adjust the positionof the lower jamnut on the stem so the seast opens enough that it will not hold water applied
above the disc retainer; and the disc returns to contact the seat when the weight is removed.
8) Tighten upper jamnut against lower jamnut.
9) Install spring chamber on valve body.
10) Install capscrews through holes in spring chamber. Tighten capscrews to secure spring chamber to valve body.
OVERHAUL
Rebuilding of the vacuum breaker should not be necessary under normal operating conditions. Should the vacuum breaker
become worn or damaged, parts kits are available. See Parts/ Overhaul.