Valve

Details Valve Valve

1980-01-21

1981-06-23

Schwadron, Martin P.

Fluid handling

With repair, tapping, assembly, or disassembly means

Assembling, disassembling, or removing cartridge type valve

251214, 251330, 251 636, F16K 4300

Patent

active

042744326

ABSTRACT:
A valve having a valve stem extending through a bonnet with packing therebetween and a back seat and back seat valve member cooperable to isolate the packing from pressure within the valve body wherein an auxiliary piston is provided to positively hold the back seat valve member on the back seat under the influence of pressure other than the pressure within the valve body. The back seat valve may be actuated by auxiliary pressure while changing the bonnet packing and may also serve to positively close the valve in the case of a malfunction of the usual closing mechanism.

REFERENCES:
patent: 2011087 (1935-08-01), Sherman
patent: 2780233 (1957-02-01), Volpin
patent: 3096070 (1963-07-01), Wolfensperger
patent: 3348567 (1967-10-01), Volpin
patent: 3765642 (1973-10-01), Nelson
patent: 3770247 (1973-11-01), Nelson
patent: 3958592 (1976-05-01), Wells et al.
patent: 4029294 (1977-06-01), McCaskill et al.
patent: 4149558 (1979-04-01), McGee et al.
patent: 4230299 (1980-10-01), Pierce, Jr.
Composite Catalog of Oil Field Equipment and Services, 33rd Revision, 1978-1979, p. 5331.

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