Positive acting check valve of polyvinylchloride to open in resp

Details Positive acting check valve of polyvinylchloride to open in resp Positive acting check valve of polyvinylchloride to open in resp

1975-04-25

1976-03-16

Cline, William R.

Fluid handling

Line condition change responsive valves

Direct response valves

137540, 13754323, 251368, F16K 1502

Patent

active

039439690

ABSTRACT:
A valve, the housing and gate of which are composed of molded rigid polyvinylchloride, the valve body having an interior chamber with a main upstream inlet and a main downstream outlet and an annular valve seat in the housing, and a gate being arranged in the housing which is spring-biased to a normally closed position with an O-ring in sealing relation on the seat to effectively block fluid flow through the valve and said spring being selected so as to have a resiliency to yield in response to predetermined upstream fluid pressure to unseat the valve member and permit flow of fluid through the valve so long as the predetermined pressure is exceeded.

REFERENCES:
patent: 2206356 (1940-07-01), Hutchings
patent: 2538364 (1951-01-01), James et al.
patent: 2650793 (1953-09-01), Clark, Jr. et al.
patent: 2679858 (1954-06-01), Kemp
patent: 3072143 (1963-01-01), Fleischhacker
patent: 3550902 (1970-12-01), Pidgeon
patent: 3756273 (1973-09-01), Hengesbach
patent: 3770009 (1973-11-01), Miller

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