Operating instructions

SHERWOOD LPG PRODUCTS
Vapor-Return Section
Replacement Procedures
Step 1: Disassembly
1. Remove all traces of LP gas from
the cylinder using the procedures
specified in National Fire
Protection Association Pamphlet
#58 and National Propane Gas
Association Installation and
Service Guide Book #4003.
2. Clean the valve with clean
compressed air so dirt does not
enter the valve’s interior.
3. Remove the valve cap. Remove and discard the gasket inside the ACME
connector. Destroy the gasket so it cannot be reused.
4. Using the
3
⁄4" wrench, remove (turn counterclockwise) the ACME connector
section from the valve. If necessary, prevent the lower valve section from
turning by holding it steady with the adjustable wrench (or 1
1
⁄4" open-end
wrench). Destroy the old ACME connector so it cannot be reused.
5. Remove and discard the poppet and poppet spring. Destroy the parts so
they cannot be reused.
6. Remove and discard the O-ring where the upper and lower valve sections
mate. Destroy the O-ring so it cannot be reused.
Step 2: Inspection
1. Inspect the internal valve shoulder of the lower section, where the O-ring
seats. If the seat is nicked, scratched, or distorted, replace the entire valve.
Destroy the old valve so it cannot be reused.
2. Replace the entire valve if the internal threads are damaged or worn.
Destroy the old valve so it cannot be reused.
3. Using a fine wire brush, clean the old threadlocking residue from the fine
female threads of the lower section. Blow the valve clean with compressed
air. Clean all other threads as necessary.
4. Inspect the internal poppet-guide post for wear or nicks. If any are present,
replace the entire valve. Destroy the old valve so it cannot be reused.
5. Inspect the valve cap. If it is cracked, worn, loose, or defective in any way,
replace the cap.
Instruction Sheets
Tools Required
❏ A medium adjustable wrench or 1
1
⁄4"
open-end wrench.
❏ A
3
⁄4" open-end wrench
❏ Small, fine wire brush
❏ Small wooden dowel
❏ Torque wrench, 0–50 foot-pounds
❏
3
⁄4" crowfoot adapter
❏ Mild ammonia-free soap-and-water
solution for lubrication
❏ Commercial leak-test solution*
SAFETY INSTRUCTIONS
t6TFBOBDDVSBUFUPSRVFXSFODIUPUJHIUFOUIFWBMWFTFDUJPOT
t"MXBZTEFTUSPZBEBNBHFEPSXPSOWBMWFTPJUDBOOPUCFSFVTFE
Step 3: Re-Assembly
1. Lubricate a new #G019B O-ring with a mild, ammonia-free, soap-and-water
solution. Remove the excess liquid and install it into the valve at the O-ring
seat. Be careful not to get any liquid on the female threads since it prevents
the threadlocking adhesive from curing.
2. Put two to three drops of omniFIT
®
1570 or Loctite
®
272 on the middle male
threads of the new ACME connector.
3. Install the new poppet spring onto the round stem of the new poppet. The
hexagonal poppet stem must face up as shown. Guide the lower poppet
stem into the middle of the poppet guide.
4. Push the poppet and spring all the way down and use a wooden dowel
to hold it down. Slide the new ACME connector over the dowel and turn
clockwise until the fine threads engage. NOTE:Loctite 272 will begin to
cure within seconds of being confined within brass threads. If this happens
before the following tightening procedure is completed, the sections must
be separated, cleaned, and reassembled.
5. Continue screwing the ACME connector into the lower section until it
bottoms out. Tighten the sections between 25 to 35 foot-pounds of torque.
Do not overtighten the sections.
6. Push the poppet down several times to make sure it moves without binding.
7. Install a new #797-2 gasket into the inlet of the ACME fitting.
Step 4: Testing
1. Pressurize the cylinder with LP gas at 50 to 150 psig. Using the commercial
leak-test solution, check for leaks where the ACME connector screws into the
valve body. As a precaution, check the valve-to-tank connection as well.
2. Keep your body away from the valve inlet. Carefully place two or three
drops of commercial leak-test solution around the poppet seat and inspect
for leaks. When complete, use a clean cloth or paper towel to remove the
excess liquid. Do not use a soap-and-water solution for this test — it
could corrode the internal parts.
3. If any leaks are found, evacuate the tank according to NFPA Pamphlet #58
and NPGA Installation and Service Guide Book #4003. Remove and destroy
the entire valve so it cannot be reused. Install a new valve.
4. If no leaks were found, the valve may now be placed in service. Make sure
the valve cap is in place and tightened.
Warn Your Customer
t Leaking gas can cause fires or explosions
t If you smell gas:
- Immediately call your gas supplier from a neighbor’s phone
- If you can’t reach your gas supplier, call the Fire Department
- Do not touch electrical switches or telephones
- Do not light appliances
* Must be approved for use on brass and with LP gas.
Note: Torque wrench and crowfoot adapter should all have the same drive size.
GASKET
#797-2
ACME CONNECTOR
#1876-2
POPPET
#1876-40
POPPET SPRING
#1876-12
BODY O-RING
#GO19B
Gasket
#797–2
ACME Connector
#1876–2
Poppet
#1876–40
Poppet Spring
#1876–12
Body O-Ring
#GO19B
Figure 1
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