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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
174‑‑‑0101 PP
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Maintenance Instructions on Back
The 174 Series valves are designed where maximum pressure control is needed such as bypassing a pump in
order to reduce the pressure at the outlet.
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.
Installation
Warnings
•
Fire Hazard
– Death or serious injury could result from spilled liquids.
• Install in accordance with all applicable local, state, and federal laws.
• 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.
• Piping could be under pressure. Liquid and vapors may be expelled from the piping, valves or fittings while
performing installation. Liquids and vapors could catch fire or cause an explosion.
Avoid
sparks, open flame,
or hot tools when working on valves.
Steps
1. Inspect valve for shipping damage. Do not use if valve is damaged. Call
Morrison Bros. Co. for assistance.
2. Inspect valve openings for foreign matter such as packaging material.
Remove any that is found.
3. Prior to mounting the valve in the piping, verify the intended direction of
liquid flow. The valve inlet and outlet are marked on the appropriate hex
where the piping connects.
4. Apply a non-hardening, fuel resistant thread sealant to the male threads
of the pipe. When threading the valve onto the piping, and the piping into
the valve, make certain to wrench on the valve hex closest to the end you
are threading. Connect piping to valve inlet and outlet and complete the
rest of the piping.
5. You may now introduce liquid to the valve. Inspect the valve and piping
for leaks. Repair as is necessary.
6. If you wish to adjust the opening setting of the valve, remove the lock
cap on the valve by loosening the single cap screw and slipping off the
lock cap.(See Fig. 1.) This will expose the adjustment screw. (See Fig.
2.) To change the opening setting, loosen the lock nut on the adjustment
screw and turn the adjustment screw. Clockwise turning will increase the
opening setting. Counter-clockwise turning will decrease the opening
setting. There is string packing used to seal around the adjustment
screw. This may need to be replaced after making adjustments. It can
be purchased from Morrison Bros. Co. Once you have achieved your
desired setting, tighten the lock nut on the adjustment screw and replace
the lock cap.
Fig. 174 By-Pass Valve
Installation & Maintenance Instructions
FIGURE 1
LOCK
CAP
CAP
SCREW
FIGURE 2
ADJUSTMENT
SCREW
LOCK NUT
BONNET
GASKET
