Check valve apparatus

Details Check valve apparatus Check valve apparatus

1992-04-20

1993-03-02

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

With separate connected fluid reactor surface

137510, 251364, 251900, F16K 17168

Patent

active

051900742

ABSTRACT:
Check valve apparatus for a fluid flow operates in response to a positive pressure of the fluid to move a spring biased diaphragm and valve element off its seat to allow the fluid to flow through the apparatus. When the pressure of the fluid flow drops, the valve is urged against its seat to provide a positive stop to the fluid flow. The valve apparatus includes a stem extending exteriorly of a housing in which the apparatus is disposed so that the valve may be manually opened by moving the valve off its seat to clear debris without contaminating the hands of the person working on the valve.

REFERENCES:
patent: 455853 (1891-07-01), Shepard
patent: 2258335 (1941-10-01), Moore
patent: 2670922 (1951-04-01), Carlisle et al.
patent: 2731981 (1956-01-01), Glasser
patent: 2778598 (1957-01-01), Bolling
patent: 2886058 (1959-05-01), Horton
patent: 2960998 (1960-11-01), Sinker et al.
patent: 2977980 (1961-04-01), Scholin
patent: 3943969 (1976-03-01), Rubin et al.
patent: 4245667 (1981-01-01), Braukmann
patent: 4682625 (1987-07-01), Christopher

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