15
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.
DISASSEMBLY OF DOUBLE SETTING RV STYLE RELIEF VALVE
Refer to the sectional drawing shown in Figure 5.9.
1. Turn off pump and lock out energy source to driver.
2. Close inlet and discharge valves.
3. To drain pump, follow the procedure in Section 7, INSTRUCTIONS FOR DRAINING PUMP.
4. Loosen lock and seal nut (27). Decrease pressure on spring (29) by turning adjusting screw (26)
counterclockwise until it turns freely.
5. After decreasing pressure on spring (29), remove relief valve cap (24) by unscrewing it from
faceplate (23B).
6. Remove spring (29), spring guide (28), poppet (30), and spring washer (31).
7. Remove operating piston (59). Remove o-ring (AP) if required.
8. After several pump disassemblies, it is necessary to change locking seal nut (27). Remove adjusting
screw (26) from relief valve cap (24). Remove locking seal nut (27) from adjusting screw (26). Keep
threads on adjusting screw clean and free from dirt. Also remove any nicks or dents from damaged
threads to prevent damage to sealing surfaces of seal nut.
9. Usually there is no need to disassemble ball handle (AK) and its components from adjusting
screw (26) except if parts need replacement.
10. Inspect all parts and replace all worn or damaged parts as required.
ASSEMBLY OF DOUBLE SETTING RV STYLE RELIEF VALVE
Refer to the sectional drawing shown in Figure 5.9.
1. Install poppet (30) and spring washer (31) into faceplate (23B).
2. Install spring (29) into faceplate (23B) making sure that spring is centered on poppet (30) and resting on
the spring washer (31).
3. Place pilot of spring guide (28) into spring (29).
4. Turn adjusting screw (26) down into relief valve cap (24) with lever in high pressure position. Move lever
to low pressure position; this should leave operating piston (59) out past edge of relief valve cap (24).
(O-ring friction should hold operating piston temporarily). Place new relief valve cap gasket (25) on relief
valve cap (24).
5. Slide tip of operating piston (59) into spring guide (28) while holding double setting relief valve mechanism
by adjusting screw (26) and ball handle (AK).
6. Hold adjusting screw (26) and turn relief valve cap (24) to engage it into threads of faceplate (23B).
7. Tighten relief valve cap (24), but DO NOT allow adjusting screw (26) to come out of relief valve cap or
engagement of operating piston (59) in spring guide (28) will be lost.
8. Adjust relief valve by following steps shown in how TO ADJUST THE DOUBLE SETTING RV STYLE
RELIEF VALVE. Tighten lock and seal nut (27). Check operation of lever.
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