Operating instructions

SHERWOOD LPG PRODUCTS
Instruction Sheets
Bonnet Replacement Procedures
Step 1: Bonnet Removal
1. Remove all traces of LP gas from the cylinder using the procedures specified
in NFPA Pamphlet #58 and NPGA Installation and Service Guide Book #4003.
Secure the cylinder with the chain wrench or cylinder vise so it cannot be moved.
2. Use the screwdriver (or #25 Torx driver) to remove the handwheel screw and
handwheel. Use the socket and wrench to remove the bonnet assembly (left-
hand thread) by turning it clockwise. Destroy the old bonnet assembly so it
cannot be reused.
Tools Required
R Chain wrench or c
ylinder vise
R
Medium slotted screwdriver
(or #25 Torx
®
screwdriver)
R Hex socket,
7
⁄
8
"
R
Torque wrench, 50 to 60
foot-pounds
R Commercial leak-test solution*
SAFETY INSTRUCTIONS
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Step 2: Inspection
1. A damaged shut-off seat may not allow a positive seal. Use a light to inspect
the valve shut-off seat located at the bottom of the bonnet-connection
opening. The outer rim of the seat is about
3
⁄8" in diameter. If the seat is nicked,
scratched, or distorted, replace the entire valve. Destroy the old valve so it
cannot be reused.
2. Inspect all threaded connections. Replace the entire valve if threaded connection
is damaged or worn. Destroy the old valve so it cannot be reused.
3. Inspect the safety-relief device. If the openings are clogged with foreign
matter or if it shows any sign of tampering, replace the entire valve. Destroy
the old valve so it cannot be reused. Never attempt to repair or clean a safety-
relief device.
Step 3: Re-Assembly
1. Before installing the bonnet assembly into the valve body, make sure the stem
is turned fully counterclockwise at the top of the bonnet, as shown in Figure 1.
The stem threads will be exposed as shown. This prevents the valve seat from
damaging the nylon stem seat as the bonnet is tightened.
2. Screw the new bonnet assembly (left-hand thread) counterclockwise into the
valve body. Use the socket and torque wrench to tighten the bonnet between
50 and 60 foot-pounds. Thread sealant is not necessary since the bonnet seat
provides a metal-to-metal seal.
3. Re-install the handwheel and handwheel screw onto the bonnet. The screw is
self tapping and the new stem is not threaded. Tighten the screw until it bottoms
and the handwheel is tight.
Step 4: Testing
1. Turn the handwheel through its full range to verify easy operation. If there is any
binding or grinding, replace the entire valve. Destroy the old valve so it cannot
be reused.
2. Pressurize the cylinder with LP gas at 50 to 150 psig. Plug the outlet. Open the
valve halfway and thoroughly check the bonnet nut, stem, and cylinder-to-valve
connections for leaks using a mild ammonia-free soap-and-water solution or
commercial leak-test solution.
3. If no leak was found, proceed to #4. If a leak was found, evacuate the cylinder
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. Turn the handwheel clockwise until the bonnet just bottoms on the seat. Tighten
the handwheel approximately one tenth of a turn further. Carefully remove the
outlet plug. Thoroughly check the outlet for leaks using a leak-test solution. If a
leak is found, evacuate the cylinder 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.
5. If no leaks were found, blow the outlet dry with clean, dry compressed air.
The cylinder can now be filled according to NPGA Bulletin #129 or #130.
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.
Figure 1
Handwheel
Left-Hand Thread
Self Tapping Screw
Valve Chamber
Wrench Flat
Bonnet Assembly
#3250-8HL
Stem
TABLE 1
Bonnet
Number Valve Model Numbers
3250-8HL 1425B
1426B
1427B
1445B
1445BMF
1445CA
1446B
1446BMF
1447B
1447BMF
2035A (Series)
3250A-375
3250A-375MU
3250A-405
3250AD
3250AD-7
3250AD-7X
3250ALG-7
3250AALG-375
3250ALG7-11.0
3250ALM-375
3250ALG-405
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