Check valve with relief-valve feature

Details Check valve with relief-valve feature Check valve with relief-valve feature

1981-05-18

1984-07-03

Nilson, Robert G.

Fluid handling

Removable valve head and seat unit

1375121, 137527, 251337, F16K 1503

Patent

active

044573332

ABSTRACT:
The invention contemplates a check-valve construction which exhibits substantially elevated resistance to onset of unidirectional flow (i.e., to valve opening), as compared with conventional constructions. This elevated resistance to valve-opening is achieved through use of a knuckle joint, connecting the valve member to the valve body and spring-urged to its most-spread condition when the valve member is in its closed position. The invention is shown and described in connection with a check valve having two valve members, each of which derives materially enhanced resistance to valve-opening displacement, through use of a separate spring-loaded knuckle joint associated with each of the respective valve members.

REFERENCES:
patent: 2827921 (1958-03-01), Sherman
patent: 2927182 (1960-03-01), Barkan
patent: 4019532 (1977-04-01), Schittek
patent: 4257444 (1981-03-01), Ogle

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