Selective back seat valve

Details Selective back seat valve Selective back seat valve

1977-05-25

1979-04-17

Schwadron, Martin P.

Fluid handling

With repair, tapping, assembly, or disassembly means

Assembling, disassembling, or removing cartridge type valve

251214, 251330, 277 9, F16K 4300

Patent

active

041495586

ABSTRACT:
A non-rising valve stem is provided with a shoulder that, in normal opening and closing of the valve, remains free of a complementary seat formed inside the valve bonnet. Should the valve stem packing in the bonnet begin to leak while the valve is open and under pressure, the bonnet packing gland may be backed out a few turns to effect a seal between the shoulder and seat. Then a disassembly, packing change, reassembly and testing may be effected.

REFERENCES:
patent: 2780233 (1957-02-01), Volpin
patent: 3190302 (1965-06-01), Volpin
patent: 3348567 (1967-10-01), Volpin
patent: 3349789 (1967-10-01), Crain et al.
patent: 3412750 (1968-11-01), Volpin
patent: 3788600 (1974-01-01), Allen
patent: 3990679 (1976-11-01), Boitnott
patent: 4029294 (1977-06-01), McCaskill et al.

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