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ANDERSON GREENWOOD SERIES 96A VACUUM BREAKER
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
7.2.4 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",
and will be supplied in the kit as a syringe
type applicator. The seat ring and sponge
seat should be cleaned with alcohol or
other suitable solvent compatible with
the elastomer such that no residual dried
epoxy is left. Any leftover cleaning solvent
should be wiped off completely. Apply
adhesive to seat ring sparingly and spread
uniformly in thin layer, approximately
.001 to .003 (.025 to .076 mm) thick, with
acid brush or spatula. Before cementing
the sponge seat onto the seat ring,
additionally apply epoxy to the side of the
sponge seat that will mate with the seat
ring. Place sponge seat on seat ring and
press in place, smoothing out all ripples.
Avoid stretching the sponge seat. Any
excess epoxy that squeezed out should be
cleaned with no traces of the epoxy on the
top side of the sponge seat. 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.
SERIES 96A VACUUM BREAKER SOFT GOODS KIT (REFERENCE DOCUMENT 04-4744)
Material
NBR
04-4744 - 112
FKM
04-4744 - 116
EPR
04-4744 - 906
Epoxy (Syringe Applicator)
7.2.5 Install new O-ring seat into seat ring
following the sequence depicted in Figure 3.
7.2.6 Assemble seat plate bolt to guide tube.
Place tube in "Vee" block, align holes and
insert spring pin.
7.2.7 Assemble guide tube to seat plate in the
reverse order from that described in 7.1.1.
Torque locknut for snug fit. Make sure the
retainer and O-ring are in place for a seal
around bolt shank.
7.2.8 Assemble guide rod to body in reverse
order from that described in 7.1.2, torque
bolt 18-24 ft·lb (24.4 -32.5 Nm).
7.2.9 Assemble internal parts and inlet screen
in reverse order from that described
in 7.1.0 and 7.1.1. Be careful not to
damage the PTFE surface on the guide
rod. Apply a light coat of lubricant to all
threads before assembly.
8 LEAK AND VACUUM SET VERIFICATION
TESTING
8.1 Pressurize vacuum breaker to 150% of the
positive working pressure.
8.2 Apply leak test solution around all bolts and
sealing surfaces.
8.3 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.
8.4 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).
Tank connection
4"
6"
04-4744 - 113
04-4744 - 114
04-4744 - 117
04-4744 - 118
04-4744 - 907
04-4744 - 908
05-1501-044
8"
12"
04-4744 - 115
11115086
04-4744 - 119
11115086
04-4744 - 905
11115086
9 SOFT GOODS REPAIR KIT
The kits listed below are available from stock.
To order, specify the number indicated in
the following table. To ensure the purchase of
correct soft goods kits, the order should specify
the valve model number and serial number.
Kits recieved should be stored in a controlled
environment, with proper protection. Each kit
contains the two-part adhesive used to cement
the sponge seat, and must be used within one
year of receipt due to expiration. If epoxy has
expired, a new epoxy can be ordered under the
referenced part number in the table below.
16"
4
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