Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1994-06-02
1995-06-20
Chambers, A. Michael
Fluid handling
Line condition change responsive valves
Direct response valves
13754313, 251 86, F16K 2104
Patent
active
054253977
ABSTRACT:
A check valve has a point-to-point articulated connection between its valve stem and valve head so that the head is free to skew when unseated. The valve head is positioned within the interior of the valve body between a valve seat and the trailing end of the valve body and retracts further into the valve body when unseated by the introduction of gaseous fluid into the valve body. The leading end of the valve stem is cone-shaped, and is received within a cone-shaped recess formed in the trailing end of the valve head. A bias member urges the valve stem toward the valve head so that the vertex of the cone-shaped valve stem is in point-to-point contact with the vertex of the cone-shaped recess. When gaseous fluid is introduced into the valve body, the valve head unseats from the valve seat and is free to skew with respect to its seated orientation, but since it retracts into the valve body, the inner sidewalls of the valve body prevent excessive skewing. A spear formed integrally with the valve head extends through a central opening formed in the valve seat and also prevents excessive skewing.
REFERENCES:
patent: 674674 (1901-05-01), Fernald
patent: 2264656 (1941-12-01), Briscoe et al.
patent: 2750958 (1956-06-01), Baker et al.
patent: 3396743 (1968-08-01), Mackal et al.
Chambers A. Michael
Mason, Jr. Joseph C.
Smith Ronald E.
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