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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
174‑‑‑0101 PP
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Failure to follow any or all of the warnings and instructions in this document could result in a hazardous
liquid spill, which could result in property damage, environmental contamination, fire, explosion, serious
injury or death.
Maintenance
Annual inspection, at a minimum, is required to verify valve condition and operation.
WARNINGS
•
Fire Hazard
– Death or serious injury could result from spilled liquids.
• Follow your employer’s instructions for inspecting valves.
• You must be trained to inspect these valves. Stop now if you have not been trained.
• For your safety, it is important to follow local, state, federal and/or OSHA rules that apply to working inside,
above, or around the storage tank and piping area. Use all personal protective equipment required for
working in the specific environment.
• Valves and piping could be under pressure. Liquids and vapors could be expelled from tank piping, valves
or fittings while performing maintenance. Liquids and vapors could catch fire or cause an explosion. Avoid
sparks, open flame, or hot tools when working on valves.
Steps
1. Inspect the valve body for damage, leaks, or excessive corrosion. If any are found, replace the valve.
2. Inspect the valve bonnet gasket (See Fig. 2) for damage or leaks. If either is found, replace the bonnet gasket
with an original replacement from Morrison Bros. Co.
Note:
Bonnet will be under strong spring pressure. Use
extreme caution when removing bonnet.
3. To replace the bonnet gasket, drain the pipe of liquid and pressure. Remove the valve bonnet and old gasket.
Clean the area where the gasket seals on the body and bonnet. Install the new gasket on the bonnet. Apply a
non-hardening, fuel resistant thread sealant to the male threads of the bonnet. Thread the cap into the body
and tighten. Do not over-tighten the cap to the point where the gasket starts pushing out. Introduce liquid back
into the pipe and watch the gasket for leaks. If leaks are found, try tightening the cap slightly. If leaks still
persist, replace the valve.
Failure to follow any or all of the warnings and instructions in this document could result in a hazardous
liquid spill, which could result in property damage, environmental contamination, fire, explosion, serious
injury or death.
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