Valve with heat-responsive bearing assembly providing back seat

Details Valve with heat-responsive bearing assembly providing back seat Valve with heat-responsive bearing assembly providing back seat

1979-09-28

1981-09-15

Schwadron, Martin P.

Fluid handling

Destructible or deformable element controlled

Heat destructible or fusible

251214, 251267, 251330, 277 26, F16K 4102, F16K 1738

Patent

active

042891574

ABSTRACT:
The bearing assembly of a normally non-rising stem gate valve is provided with an annulus of fusible material. Upon subjection to a preselected temperature level, the fusible body melts out of the way, permitting the stem to raise slightly, making up a metal-to-metal seal between the valve stem and bonnet. This forms another line of defense against consequences from loss of the sealing normally provided by the valve stem packing.

REFERENCES:
patent: 2780233 (1957-02-01), Volpin
patent: 3349789 (1967-10-01), Crain et al.
patent: 3788600 (1974-01-01), Allen
patent: 3789875 (1974-02-01), McGee
patent: 3838705 (1974-10-01), Diehl et al.
patent: 3842853 (1974-10-01), Kelly et al.
patent: 3896835 (1975-07-01), Wicke
patent: 4125060 (1978-11-01), McGee et al.
patent: 4138091 (1979-02-01), McGee
patent: 4149558 (1979-04-01), McGee et al.
patent: 4214600 (1978-07-01), Williams, Jr. et al.

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