Low emission valve

Details Low emission valve Low emission valve

1982-10-14

1985-08-27

Chambers, A. Michael

Valves and valve actuation

Mechanical movement actuator

Particularly packed or sealed

2513353, 137553, 277 27, 277 65, 277 89, F16K 3144, F16K 3700

Patent

active

045373850

ABSTRACT:
A low emission valve assembly for use with volatile fluids and incorporating a pair of independent inner and outer metal bellows mechanical seal assemblies with means to compensate for thermal expansion of a liquid between the seals and which means transmits product pressure within the valve to the seals, so that the inner seal floats with a near zero pressure differential from outside to inside. The compensating means can be a pressure responsive bellows arrangement or a pressure response diaphragm arrangement.

REFERENCES:
patent: 684191 (1901-10-01), Chatham
patent: 2246277 (1941-06-01), Davidson
patent: 2652223 (1953-09-01), Peters
patent: 3260530 (1966-07-01), Jelatis et al.
patent: 3333856 (1967-08-01), Votik
patent: 3626770 (1971-12-01), Lindberg et al.
patent: 3773337 (1973-11-01), Adams
patent: 3979104 (1976-09-01), La Coste
patent: 4087097 (1978-05-01), Bossens et al.
patent: 4168936 (1979-09-01), Scheller et al.
patent: 4307745 (1981-12-01), McGee

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