Operating instructions

SHERWOOD LPG PRODUCTS
Replacement Procedures
Step 1: Disassembly
1. Remove all traces of LP gas from the system using the procedures
specified in NFPA Pamphlet #58 and NPGA Installation and Service
Guide Book #4003. Remove the valve from the installation and clean
it with clean compressed air so dirt does not enter the valve interior.
2. Mount the valve in a vise. Do not overtighten. Overtightening the vise
can distort the valve body and the internal sealing seat. Should this
occur, the entire valve must be replaced. Destroy the old valve so it
cannot be reused.
3. Use the 1
1
⁄4" box wrench to remove (turn counter-clockwise) the bonnet
assembly from the valve (see Fig. 1). NOTE: An open-ended crescent
wrench may not be able to remove the bonnet nut because
the torque requirements are too high.
4. Destroy the entire bonnet assembly and handle so they cannot be
reused.
5. Remove the metal gasket where the bonnet and valve mate.
Destroy the gasket so it cannot be reused.
Tools Required
R A 1
1
⁄4" box wrench and 1
1
⁄4"
crowfoot adapter
R Torque wrench, 0–100 foot-
pounds
R Small, fine wire brush
R Commercial leak-test solution*
SAFETY INSTRUCTIONS
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Step 2: Inspection
1. Inspect the internal valve shoulder where the metal gasket seats. If the
seat is nicked, scratched, or distorted, replace the entire valve. Destroy
the old valve so it cannot be reused.
2. Inspect the threaded connection. Replace the entire valve if the internal
threads are damaged or worn. Destroy the old valve so it cannot be
reused.
3. If necessary, use a fine wire brush to clean the fine female threads of
the valve body.
4. Below the valve-to-bonnet mating seat is the smaller diameter poppet
seat. If this seat is nicked, scratched, or distorted, replace the entire
valve. Destroy the old valve so it cannot be reused.
Step 3: Re-Assembly
1. Install a new #440-11 gasket into the valve.
2. Screw the new bonnet assembly into the valve until it bottoms out.
Tighten between 50 to 60 foot-pounds of torque. Thread sealant is not
necessary since the bonnet gasket provides a positive seal. Do not
overtighten the bonnet assembly.
Step 4: Testing
1. Pressurize the system with LP gas at 50 to 150 psig. Using a mild
ammonia-free soap-and-water solution, check for leaks where the
bonnet screws into the valve body and where the valve stem enters
the bonnet. As a precaution, check the piping connections as well.
2. If any leaks are found, evacuate the system 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.
3. If no leaks are found, the valve may now be placed in service.
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 or socket should have the same drive size.
Figure 1
Figure 1
Gasket
#440-11
Bonnet Assembly
#440-50L
Instruction Sheets
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