Secondary backseat for gate valve

Details Secondary backseat for gate valve Secondary backseat for gate valve

1986-07-18

1987-07-28

Rosenthal, Arnold

Valves and valve actuation

Lost motion between actuator and valve

251 636, 251330, F16K 4114

Patent

active

046827579

ABSTRACT:
A rising stem expanding gate valve including an improved metal-to-metal stem backseat seal assembly. An axially slidable seal ring is press fit onto the valve stem and is adapted to seal against a counterbored bonnet seat portion to provide a secondary metal-to-metal stem to bonnet seal. The seal ring is allowed to move a limited axial distance on the valve stem such that upon upward axial movement of the valve stem. The seal ring is repositioned in an axially downward direction about the valve stem and, consequently, is firmly sealed against the bonnet seat portion. Upon subsequent downward movement of the valve stem, the seal ring is repositioned in an axial upward direction about the valve stem such that the seal ring is in its original position about the valve by a repositioning means.

REFERENCES:
patent: 855385 (1907-05-01), Churchill
patent: 3013769 (1961-12-01), Volpin
patent: 3896835 (1975-07-01), Wicke
patent: 4120596 (1978-10-01), Kunkle
patent: 4245661 (1981-01-01), McGee
patent: 4271857 (1981-06-01), Rowe
patent: 4307745 (1981-12-01), McGee
patent: 4474203 (1984-10-01), Meyer
patent: 4510960 (1985-04-01), Jennings et al.

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