17
TO ADJUST RELIEF VALVE
Warning: Take precautions necessary to prevent personal injury or physical damage
That could be caused by any loss of the product being pumped while
Adjusting relief valve.
Relief valve must be adjusted under conditions identical to the operating conditions.
(Viscosity, RPM, etc.)
1. Connect a pressure gauge near the pump in the discharge line between the pump and the
point where the discharge line will be closed. (Most pumps have tapped and plugged
holes in the case near the outlet or in the discharge flange which may be used for this
connection.
2. Remove seal cap and gasket.
3. Loosen the locknut on the adjusting screw.
4. Back the adjusting screw out to the point where the end of the adjusting screw will be at
the max dimension “A” when measured from the relief valve bonnet. See the chart under
the relief valve drawing for the proper dimension.
5. Start pump and close the discharge line slowly. Do not exceed pressure rating of pump or
other equipment between pump and discharge line valve. If this pressure is reached while
closing the discharge valve, do not close any further. (This might occur with very high
viscosity liquids) it would then be necessary to install a separate relief valve in the system
for protection. Do not run pump with closed discharge line for more than two minutes at a
time.
6. With discharge valve closed, turn adjusting screw clockwise in ½ turn increments until the
pressure gauge shows the desired pressure setting.
7. Tighten locknut.
8. Replace the gasket and seal cap.
9. Open discharge line, and turn pump off.
Relief valve is now set.
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