Operating instructions

SHERWOOD LPG PRODUCTS
Instruction Sheets
SAFETY INSTRUCTIONS
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Renovation Procedures
Step 1: Disassembly
1. Place the adapter valve in the vise so that the
handwheel is up and the valve outlet is held flat against
one of the vise jaws. Make sure that the ACME hand
nut at the bottom of the valve clears the vise jaw (see
Figure 1). Do not overtighten. Overtightening the vise
can distort the valve body, making it difficult to remove
the poppet assembly. Should this occur, the entire valve
must be destroyed so it cannot be reused.
2. Remove and discard the vent valve located on the side
of the main valve body.
3. Use the screwdriver (or #25 Torx driver) to remove the
handwheel screw and handwheel. By hand, turn the
threaded stem fully clockwise, withdrawing the bottom
of the push rod into the valve body. Turn the stem back
approximately half a turn counterclockwise to keep the
assembly loose.
4. With the 1" socket and an appropriate wrench, fully
loosen the bonnet nut by turning it counterclockwise,
as shown in Figure 2. With the bonnet threads
disengaged from the body, slowly pull the bonnet and
the attached push-rod assembly straight out of the
body. Discard the entire bonnet/push-rod assembly.
Do not reuse any of the old parts except the handwheel and screw.
Step 2: Inspection
1. A damaged valve-to-bonnet seat may not allow a positive seal. Use a light to inspect
the raised valve seat where the bottom of the bonnet nut contacts the valve when fully
tightened. If the seat is nicked, scratched, worn, or distorted, destroy the entire valve so it
cannot be reused.
2. Inspect all connections. Destroy the entire valve if any threaded connection is damaged or
has worn threads. Clean all threads as necessary.
3. Inspect the smooth bore in the valve body where the O-ring of the push rod rides. If the
bore is gouged, dented, pitted, or scratched, destroy the entire valve so it cannot be
reused. If the bore is in good condition but is dirty, clean it with a toothbrush and alcohol.
Re-inspect the bore. Do not use sandpaper, emery cloth, or similar abrasive to clean the
bore. Abrasives will scratch the sealing surface too deeply.
4. Inspect the vent opening on the side of the valve. If the orfice sealing surface is dirty, clean
it with a toothbrush and alcohol. if the orifice sealing surface is gouged, dented and pitted,
corroded, or scratched, destroy the entire valve so it cannot be reused.
Tools Required
R
Medium slotted screwdriver
(or #25 Torx
®
screwdriver)
R Deep hex socket, 1”
R Torque wrench, 0–100 foot-pounds
R Bench vise with soft-
faced jaws
R Petroleum jelly lubricant
R
Toothbrush
R Alcohol
R Fine wire brush
R
Pressurized LP gas tank fitted with a
623A filler valve
R Commercial leak-test solution*
Step 3: Re-Assembly
1. Use petroleum jelly to lightly lubricate the inner bore
of the valve body where the O-ring travels up and
down.
2. Turn the new bonnet nut so it is in the middle of the
upper threaded stem, as shown in Figure 3. Slide the
locking groove of the lower stem onto the upper stem
locking pin. Hold the top of the upper stem. Turn the
bonnet nut counterclockwise down the stem so that
the nut covers the top of the lower stem, preventing
the lower stem from slipping off the locking pin (see
Figure 4).
3. Insert the new bonnet and push-rod assembly, push rod first,
into the valve body. By hand, screw the bonnet nut into the
valve until the push rod almost touches the inside of the rod
guide at the bottom of the valve.
4. Hold the valve and bonnet nut to prevent the nut from turning
in the valve. Turn the threaded stem counterclockwise so
the rod passes through the hole in the middle of the guide. If
binding occurs, loosen the stem and try again. Finish turning
the bonnet nut fully clockwise into the valve body.
5. Thread sealant is not necessary on the bonnet nut since the bonnet seat provides a metal-
to-metal seal. Secure the valve in a vise as described earlier. Use an accurate torque
wrench to tighten the bonnet nut at 50 to 60 foot-pounds. Do not overtighten.
6. Replace the handwheel and handwheel screw. Tighten the screw between 20 and 25
inch-pounds. Install the new vent valve finger-tight into the side of the adapter-valve body.
Step 4: Testing
1. Turn the handwheel through its full range to ensure easy operation. If there is any binding
or grinding, destroy the entire valve so it cannot be reused.
2. Turn the handwheel fully clockwise to withdraw the push rod fully into the valve body.
Note that this does not “close” the adapter valve since it does not have any internal
shutoff seat.
3. Install the adapter valve onto a Sherwood 623A Filler Valve pre-installed on a pressurized
LP gas tank. Plug the adapter valve outlet with an appropriate (
1
⁄2" or
3
⁄4") NPT pipe plug.
Never screw the adapter valve into the filler valve when the push rod is extended
past the cone-shaped rod guide. This can force the filler valve open before the hand nut
is fully tightened, releasing liquid LP gas. Never use a 902A or 902B Unloading Adapter
on anything but a Sherwood 623A Filler Valve. Permanent damage to both parts
can result.
4. Turn the handwheel fully counterclockwise to extend the push rod, opening the filler valve.
Using a commercial leak-test solution approved for use on brass and with LP gas, check
for leaks at the bonnet nut, stem thread, inlet collar, and vent valve.
5. If any leaks are found, close the valve (turn clockwise). Open the vent valve on the
side of the adapter valve body. When the venting stops, remove the adapter valve from the
filler valve. Do not attempt to repair the leak. Destroy the entire adapter valve so it cannot
be reused.
6. If no leaks are found, close the valve (turn clockwise) to close the filler valve. Open the
vent valve on the side of the adapter valve body. The adapter valve may now be placed
in service.
* Must be approved for use on brass and with LP gas.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 1
Figure 2
Figure 3
Figure 4
Vent Valve
1931-24A
Stem
Bonnet Nut
Lower Stem Assembly
#902-40
NOTICE:
All Sherwood products must be used in strict compliance with the requirements
and provisions of National Fire Protection Association Pamphlets #54 and #58,
DOT, ANSI, and all applicable federal, state, provincial, and local standards, codes, regulations, and
laws. It is the responsibility of the sellers, installation and maintenance personnel, and end users to
remain knowledgeable of and in compliance with all standards, codes, regulations, and laws.
All Safe, Inc. 1-866-958-3473