Operating instructions
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 vice
jaws. Make sure that the ACME hand nut at the bottom of
the valve clears the vice jaw (see Fig. 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 Fig. 2. With the bonnet threads disengaged from the body, slowly
pull the bonnet and the attached plug and plunger assembly straight out of the body until the
connection of the bonnet assembly and plug and plunger assembly is exposed. Disengage the
bonnet assembly from the plug and plunger assembly and push the plug and plunger assembly
through the valve body and remove it from the inlet side of the valve body. Discard the entire
bonnet/plug and plunger assembly. Do not reuse any of the old parts except the handwheel and
the 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 orifice sealing surface is dirty,
clean it with a toothbrush and alcohol. If the orifice sealing surface is gouged, dented, pitted,
corroded, or scratched, destroy the entire valve so it cannot be reused.
SHERWOOD LPG PRODUCTS
Instruction Sheets
Tools Required
❏ Medium slotted screwdriver
(or #25 Torx
®
screwdriver)
❏ Deep hex socket, 1”
❏ Torque wrench, 0–100 foot-pounds
❏ Bench vise with soft-
faced jaws
❏ Petroleum jelly lubricant
❏ Toothbrush
❏ Alcohol
❏ Fine wire brush
❏ Pressurized LP gas tank fitted with a
PV623B or PV1855SD filler valve
❏ Commercial leak-test solution*
SAFETY INSTRUCTIONS
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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. Insert the plug and plunger assembly into the inlet of the valve until the upper plug (with the
O-ring) extends past the bonnet portion of the body (see Fig. 4).
3. Turn the new bonnet nut so it is in the middle of the upper threaded stem as shown in Fig. 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 Fig. 4).
4. Push the new assembly into the valve until the bonnet nut engages the threads in the body.
Make sure the upper stem and plunger assembly does not disengage during assembly. Turn the
bonnet nut clockwise (by hand) until the threads bottom out into the body.
5. Thread sealant is not necessary on the bonnet nut since the bonnet seat provides 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 over tighten.
6. Replace the handwheel and handwheel screw. Tighten the screw between 20 to 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 PV623B or PV1855SD 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 in an
extended position. This can force the filler valve open before the hand nut is fully tightened,
releasing liquid LP gas. Never use a PV903A or PV903B unloading adapter on anything but
a Sherwood PV623B or PV1855SD 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
Vent Valve
#1931–24A
Figure 3
Figure 4
Bonnet Assembly
#902–41
Plug and Plunger Assembly
#903–20
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