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DOUBLE SETTING RV STYLE RELIEF VALVE
Figure 5.9
TO ADJUST THE DOUBLE SETTING RV STYLE RELIEF VALVE
WARNING! Take necessary precautions to prevent injury or physical damage that could be caused
by any loss of the product being pumped while adjusting the relief valve. DO NOT adjust the relief
valve without coupling guards in place.
The relief valve must be adjusted under conditions identical to the operating conditions. (Viscosity, rpm, etc.)
1. Connect a pressure gauge near pump in discharge line between pump and point where discharge line will
be closed.
2. Loosen lock and seal nut (27) on adjusting screw (26).
3. Back adjusting screw (26) out to minimum setting by turning ball handle (AL) counterclockwise to the point
where hex head cap screw (AN) in adjusting screw (26) will be 2 inches [50.8 mm] from relief valve
cap (24). (See DOUBLE SETTING RELIEF VALVE drawing shown in Figure 5.9.)
4. Move ball handle (AL) to normal pumping position as shown in Figure 5.9.
5. WARNING! DO NOT start the pump until all rotating shafts and couplings are properly guarded. After all
rotating shafts and couplings are properly guarded, start the pump and close the discharge line slowly.
DO NOT exceed the pressure rating of the pump or other equipment between the pump and discharge
line valve. If this pressure is reached while closing the discharge valve, DO NOT close any further. DO
NOT run the pump with a closed discharge line for more than one minute at a time.
6. With discharge valve closed and using ball handle (AL), turn adjusting screw (26) clockwise until pressure
gauge shows desired pressure setting.
7. Tighten lock and seal nut (27).
8. The relief valve is now set at desired high pressure setting.
9. Move ball handle (AL) to low pressure setting as shown in Figure 5.9 and note low pressure setting.
10. Open discharge line and turn off pump.
Relief valve is now set.
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