Specifications

RV STYLE RELIEF VALVE
Figure 5.6
TO ADJUST THE RV STYLE RELIEF VALVE
Refer to the sectional drawing shown in Figure 5.6.
• WARNING! Take necessary precautions to prevent personal 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 locknut (27) on the adjusting screw (26).
3. Back adjusting screw (26) out to point where end of adjusting screw will be 1-3/4 inches [44.5 mm] from
plug cap (24). See RV STYLE RELIEF VALVE drawing shown in Figure 5.6.
4. 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 pump or other equipment between the pump and the 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.
5. With discharge valve closed, turn adjusting screw clockwise in ½ turn increments until pressure gauge
shows desired pressure setting.
6. Tighten locknut (27).
7. Open discharge line and turn off pump.
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