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FKM
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ANDERSON GREENWOOD
SERIES 96A VACUUM BREAKER
INSTALLATION AND MAINTENANCE INSTRUCTIONS
2.2.5 Install new O-ring seat into seat ring
following the sequence depicted in Figure 2.
2.2.6 Assemble seat plate bolt to guide tube.
Place tube in “Vee” block, align holes and
insert spring pin.
2.2.7 Assemble guide tube to seat plate in the
reverse order from that described in 2.1.1.
Torque locknut for snug fit. Make sure the
retainer and O-ring are in place for a seal
around bolt shank.
3 LEAK AND VACUUM SET VERIFICATION
TESTING
3.1 Pressurize vacuum breaker to 150% of
the positive working pressure.
3.2 Apply leak test solution around all bolts
and sealing surfaces.
3.3 Reduce positive pressure to 10% of the
positive working pressure and check for
seat leaks using leak test solution. If seat
leakage occurs the probable cause is
the sponge seat not being cemented flat to
the seat ring. If leakage is unacceptable,
sponge seat must be replaced.
3.4 Reduce pressure to vacuum region and note
negative pressure at which seat plate begins
to lift. It should crack open, sufficiently to
rattle slightly, at ½ oz (0.22 kpag).
4 SOFT GOODS REPAIR KIT
The kits listed below are available from stock.
To order, specify the number indicated in
the following table. To insure the purchase of
correct soft goods kits, the order should specify
the valve model number and serial number.
2.2.4 For non-lox clean valves, cement new
sponge seat to seat ring using Resiweld
Adhesive #7004, manufactured by H. B.
Fuller Co. The adhesive is a two component
epoxy base that will cure at room
temperature. Blending ratio by weight or
volume is one to one, “Part A” with “Part B”.
The seat ring and sponge seat should be
cleaned with alcohol or other suitable
solvent compatible with the elastomer,
before cementing. Apply adhesive to seat
ring sparingly and spread uniformly in
thin layer, approximately .001 to .003
(.025 to .076 mm) thick, with knife or
spatula. Place sponge seat on seat ring
and press in place, smoothing out all
ripples. Avoid stretching the sponge seat.
Remove any excess epoxy which may
have squeezed out. Allow to cure at room
temperature for 24 hours.
For lox clean valves, cement the seat to
seat ring using Fluorelastomer Solution,
PLV-2000 with accelerator #4, manufactured
by Pelmor Laboratories Inc. This is a two
component cement consisting of a base
material and accelerator. It can be mixed
by weight or volume. By weight, use 44
parts base material to 6 parts accelerator.
By volume, use ½ pint (0.24 liter) base
material to 225 drops accelerator. Allow to
cure for 24 hours at room temperature.
Note:
PLV-2000 Fluorelastomer can
be obtained in an aerospray can with
the accelerator added, so no mixing is
necessary.
2.2.8 Assemble guide rod to body in reverse
order from that described in 2.1.2, torque
bolt 18 - 24 ft·lb (24.4 -32.5 Nm).
2.2.9 Assemble internal parts and inlet screen
in reverse order from that described
in 2.1.0 and 2.1.1. Be careful not to
damage the PTFE surface on the guide
rod. Apply a light coat of lubricant to all
threads before assembly.
TYPE 96A VACUUM BREAKER SOFT GOODS KIT (REFERENCE DOCUMENT 04-4744)
Material
Tank connection
4”
6”
8”
12”
16”
