Check valve

Details Check valve Check valve

1985-04-17

1987-02-17

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

13753317, 251357, F16K 1502

Patent

active

046432221

ABSTRACT:
An improved piston in a check valve which prevents unintentional leakage past the check valve even at low pressures. The piston includes a generally-conically shaped tip and a Teflon ring received in a groove circumscribing the tip. The valve includes first and second passageways with an annular, generally conical seat therebetween. The piston is slidably received in the second passageway such that with fluid pressure applied towards the seat, the ring abuts the seat. The proximal portion of the tip adjacent the ring is inwardly relieved such that the outermost region of the ring is unsupported. When even a low pressure is applied, the ring contacts the seat and flexs or bends towards the relieved proximal portion to provide an effective low pressure seal between the ring and seat.

REFERENCES:
patent: 1443675 (1923-01-01), Bowler
patent: 2163472 (1939-06-01), Shimer
patent: 2718373 (1955-09-01), Henry
patent: 2949928 (1960-08-01), Hobson
patent: 3029835 (1962-04-01), Biello
patent: 3085783 (1963-04-01), Pulling
patent: 3097666 (1963-07-01), Antrim

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