Dual seal for shut-off valve

Details Dual seal for shut-off valve Dual seal for shut-off valve

1994-01-03

1995-02-14

Walton, George L.

Valves and valve actuation

Mechanical movement actuator

Particularly packed or sealed

277112, 277125, F16K 4104, F16J 1524

Patent

active

053888057

ABSTRACT:
A two stage seal for a shut-off valve having a bonnet with a rotatable valve stem therethrough. The first seal is conventional packing material axially compressible to adjust its sealing force against the valve stem. The second is a cartridge seal gland with inner and outer "O" rings axially biased against the packing material by a packing nut threaded in the bonnet.

REFERENCES:
patent: 3198211 (1965-08-01), Gray, Jr.
patent: 3257095 (1966-06-01), Siver
patent: 4230299 (1980-10-01), Pierce, Jr.
patent: 4394023 (1983-07-01), Hinojosa
patent: 4486002 (1984-12-01), Riess et al.
patent: 4640305 (1987-02-01), Johnson
patent: 5263682 (1993-11-01), Covert et al.

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