All-plastic check valve

Details All-plastic check valve All-plastic check valve

1988-08-01

1989-07-25

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

137843, 604 45, 604247, F16K 1514

Patent

active

048503932

ABSTRACT:
An all-plastic check valve is incorporated into a molded plastic surgical or medical device. A tubular arm of the device serves as a barrel of the one-way check valve and has a unitarily molded seat or sealing ring and a plurality of protuberances or keeper bumps. A hollow cone-shaped or bullet-shaped stopper permits fluid flow in one direction, but in the back direction lodges against the sealing ring or seat. The material of the stopper is softer than the material of the tubular portion. At least limited flexing is possible without breaking the seal.

REFERENCES:
patent: 2960994 (1960-11-01), Shaffer
patent: 3113587 (1963-12-01), Hendley
patent: 3626980 (1971-12-01), Svensson
patent: 3768102 (1973-10-01), Kwan-Gett et al.
patent: 3797522 (1974-03-01), Carleton
patent: 3967645 (1976-06-01), Gregory
patent: 4005710 (1977-02-01), Zeddies
patent: 4158362 (1979-06-01), Durrett et al.

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