Device for venting a pump unit

Details Device for venting a pump unit Device for venting a pump unit

2006-04-18

2006-04-18

Freay, Charles G. (Department: 3746)

Pumps

Including separate port on noncyclic valve for venting or...

C417S440000, C123S516000, C137S539000

Reexamination Certificate

active

07029248

ABSTRACT:
A pump unit for the metered delivery of fuel to internal combustion engines. The pump unit comprises a housing which comprises a longitudinal bore. Located in the longitudinal bore is an overflow valve, via which fuel flows back through a channel into a fuel tank. The passage can be opened or closed by a spring-loaded closing element. Fastened to the valve shaft of the overflow valve is a ring fitting. In the longitudinal bore of the housing there is an additional thread section, via which air flows out through vent gaps into a cavity of the ring fitting.

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