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around the valve stem. Avoid using a cleaning solu-
tion as it may damage the rubber seals used in the
valve.
7. If the valve bonnet assembly is in good condition and is
not replaced, replace the bonnet seal. Do not reuse the
old bonnet seal. See "Replacement Parts:" on page 3 for
the seal number.
8. Coat seals with grease provided and position in valve
body/bonnet assembly.
9. Carefully seat the bonnet assembly on the valve body.
Be sure the seals are in their proper position. On those
valves with a spring below the disc, be sure the spring is
centered in the indentation on the inside of the valve
body.
10. After positioning the bonnet assembly, replace the
screws removed earlier.
NOTE: When replacing the bonnet assembly on the 4-
inch valve, draw it evenly into the valve body.
Finger-tighten the eight bolts. Draw the bonnet
assembly into the valve by tightening, in order,
bolts 1, 5, 7 and 3 (two turns each). See Fig. 3.
Repeat until the bonnet assembly is seated.
Tighten the remaining bolts. Torque the bolts as
follows:
Valve Size
3/4 in. (19 mm) to 1-1/2 in. (38 mm)
.2 in. (51 mm) to 4 in. (102 mm)
11. Remount the actuator on the bonnet assembly. Tighten
the two set screws (50-60 inch pounds).
12. Replace the damper crank arm assembly.
13. Re-attach the wires removed from the actuator terminals
and turn on the electrical power.
14. With the gas still off, cycle the actuator to check for
proper mechanical operation.
CAUTION
Be sure to perform a bonnet seal and seat leak
check after installation.
Be sure to read and follow all instructions that come
with the actuators, valves, seal and bonnet kits.
Valve Bonnet Replacement
The entire valve bonnet can be replaced without removing the
valve body from the gas line. Do not disassemble the valve
bonnet assembly because the valve seat is not replaceable.
For part numbers, refer to Replacement Parts in the
Specifications section. Complete instructions for replacing the
bonnet assembly are included with the replacement part.
Seal Assembly Replacement (Fig. 6)
When removing the bonnet to inspect and clean the valve,
install new seal assemblies (see Replacement Parts in the
Specification section). Coat the new seals with the grease
provided and insert them in the valve body as shown in Fig. 6.
Torque
55 in.-lb.
75 in.-lb.
Failure to properly position and seat the seals in the valve body
can result in a hazardous gas leak.
After the new bonnet assembly is installed or the bonnet is
removed for any reason, check for gas leakage around the
bonnet seal. Turn on the gas at the manual valve. Paint the
seal area with a rich soap and water solution. Bubbles indicate
a gas leak. If a leak is detected, check that the bonnet screws
are tight. If necessary, turn off the gas again and remove the
bonnet to make sure the seals are properly seated.
11
V5097A-E INDUSTRIAL GAS VALVES
BONNET SEAL
VALVE SEAL
Fig. 6. Proper positions of valve
and bonnet seals in V5097 Valves.
M11686
65-0230—07
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