Vacuum check valve

Details Vacuum check valve Vacuum check valve

1983-01-31

1985-02-19

Schwadron, Martin P.

Fluid handling

Self-proportioning or correlating systems

Supply and exhaust type

137DIG8, F02P 510

Patent

active

044999160

ABSTRACT:
A vacuum check valve comprising a single umbrella valve responding to vacuum differences between the input and output of the check valve. The check valve directs the output line to feed a vacuum operated device with either the vacuum source or reference air through a bleed passage. The umbrella shaped valve eliminates the requirement for a diaphragm operated poppet valve.

REFERENCES:
patent: 3941149 (1976-03-01), Mittleman
patent: 3955364 (1976-05-01), Lewis
patent: 3982555 (1976-09-01), Aubel et al.
patent: 4033125 (1977-07-01), Inada et al.
patent: 4054152 (1977-10-01), Ito et al.
patent: 4084606 (1978-04-01), Mittleman
patent: 4166476 (1979-09-01), Yamanaka et al.
patent: 4241751 (1980-12-01), Nonoyama et al.
patent: 4355653 (1982-10-01), Credle, Jr.
patent: 4391294 (1983-07-01), Aubel

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