Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1986-08-04
1987-07-28
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Direct response valves
13753325, 137542, 13754323, F16K 1502
Patent
active
046826254
ABSTRACT:
Shutoff valve apparatus includes a spring-loaded piston with two guide portions disposed in bores and the piston includes a fluid passage extending through the piston and communicating with one of the bores in which a guide element is disposed. Any back pressure works with the bias of the spring to help seat the valve piston to prevent fluid from leaking past the valve. Positive pressure from the working fluid opens the valve.
REFERENCES:
patent: 2670922 (1954-03-01), Carlisle
patent: 2886058 (1959-05-01), Horton
patent: 2960998 (1960-11-01), Sinker
patent: 2977980 (1961-04-01), Scholin
Nilson Robert G.
Shields H. Gordon
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