PUMP WITH INTEGRAL SUMP

摘要

The pump (10) with integral sump (100) comprises a pump body (12) having therein a bore (18) in which is disposed a resiliently biased and reciprocating pump piston (30). One end of the pump piston (30) is received within an end opening (22) of the bore (18) and a central opening (42) of an outlet member (40). The outlet member (40) includes outlet valve openings (45) each housing a coil spring (41) or elastomeric member (41A) biasing a valve member (43) against a valve seat (49). The valve openings (45) communicate with an interior opening or pumping chamber (44) of the outlet member (40) wherein a spring member (46) biases an inlet valve (60) against an inlet seat plate (70). The inlet seat plate (70) has a central opening (72) communicating on one side with a sump chamber (110). A sump sleeve (90) is located sealingly within the bore (18) and abuts the inlet seat plate (70), contains therein a slidable sump piston (98) biased by a sump spring (96), and has a plurality of inlet openings (92). Reciprocating movement of the pump piston (30) draws fluid through the inlet opening (92), sump chamber (110), central opening (72) of the inlet seat plate (70), and past the retracted inlet valve (60) so that after closure of the inlet valve (60) when the pump piston is at dead center, subsequent movement of the pump piston (30) into the bore (18) causes the fluid to be pumped past the valve seats (49) and valve members (43) and through outlet openings (48).