Check valve with aspirating function

Details Check valve with aspirating function Check valve with aspirating function

1991-05-29

1992-04-28

Nilson, Robert G.

Pumps

One fluid pumped by contact or entrainment with another

Diverse pumps

417159, F04F 554

Patent

active

051082667

ABSTRACT:
This invention relates to a check valve having a first port connected to a chamber, a second port connected to a source of vacuum having a first fluid pressure and a third port connected to a second fluid pressure. A wall which separates the second port from the third has a plurality of openings therein which allows communication from the first port to the second port. A poppet moves away from the plurality of openings to allow air to flow from the first port to the second port in response to the first fluid pressure. When the fluid pressure in the chamber substantially equals the first fluid pressure, a pressure differential between the first and second pressures moves the poppet toward the plurality of openings to allow the second fluid pressure to further evacuate air from the chamber.

REFERENCES:
patent: 3599657 (1971-08-01), Maldavs
patent: 3754841 (1973-08-01), Grabb
patent: 4380418 (1983-04-01), Crawford

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