CYLINDER VALVE REPAIR
CYLINDER VALVE DISASSEMBLY AND REPAIR
Before repairing the cylinder valve, all air must be bled
from the cylinder. Open the cylinder valve handwheel
1/2 turn and leave it open until all air has been
exhausted. Wear hearing protection if this is done in
an enclosed area to avoid possible hearing damage.
Do not attempt to repair the valve if pressure is shown
on the cylinder pressure gauge. If pressure cannot be
relieved by opening the cylinder valve handwheel, the
cylinder must be repaired. Failure to follow these
warnings can result in serious personal injury or death.
Removing the Handwheel
1. Using the spanner
wrench, remove the
locknut and spring.
2. Remove the handwheel from the top of the valve
stem.
3. Place a 7/8" socket (deep-well) on the packing gland
from the valve body. Pull the stem out of packing
gland.
4. Remove the O-ring and
valve stem washer from
the packing gland.
Note:
The O-ring removal
tool can be used to remove
the O-ring from the packing
gland.
5. Replace the handwheel on the valve stem.
6. Place the valve stem
back in the valve body.
Turn the stem until the
slot drops onto the
insert.
7. Turn the handwheel counter-clockwise until the insert
can be removed.
Note:
If the insert shows signs of wear or damage it must
be replaced.
Installing the Insert
1. Using the valve stem,
install the insert in the
valve body. Thread the
stem clockwise until
the insert is finger-tight.
2. Place a thin film of Christo-Lube lubricant on a new
O-ring.
3. Place the O-ring on the packing gland.
4. Place a new washer into the packing gland. Press the
washer down to its seal.
5. Insert the stem into the valve body. Turn the stem until
the slot drops on the insert. Thread the packing gland
into the cylinder valve until it is finger-tight.
6. Turn the valve stem counter-clockwise until the stem
stops. Be sure the gland does not turn.
7. Using the inch-pound torque wrench with a 7/8" sock-
et (deep-well), tighten the packing gland to 85-105
in.lbs.
8. The valve stem square must fit into the square hole in
the handwheel. Place the handwheel on the stem and
check the valve for proper motion. The handwheel
should move freely.
9. Replace the spring. Ensure the valve is fully open to
allow the locknut to be installed more easily.
10. Put one drop of Loctite #222 on the stem threads.
11. Using the locknut spanner wrench, press the locknut
against the spring and tighten clockwise until it is flush
with the top of the handwheel.
12. Open and close the valve completely several times to
seat the stem, insert, and the valve stem gasket.
13. Leak test the valve (see Level I).
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TAL 4011 (L) Rev. 3 - 817081
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