Valves and valve actuation – Hermetic flexible wall seal for actuator – Bellows
Patent
1987-05-27
1989-01-03
Chambers, A. Michael
Valves and valve actuation
Hermetic flexible wall seal for actuator
Bellows
251368, F16K 3100
Patent
active
047951346
ABSTRACT:
A valve with improved sealing properties comprises a housing (10a) with an inlet pipe (12a), an outlet pipe (16a) and a flange (54) which is closed by a first cover (52). An annular copper seal (24a) is placed between the flange (54) and the first cover. The first cover is closed with a thrust cover (60) which is connected to the flange by bolts (68) which pass through holes (64) in the first cover and are threaded to the flange. A valve stem (36a), a threaded portion (34a) of which is screwed into a central threaded opening (62), is inserted into the valve housing. The valve stem carries a valve head (38a) which is rotatable with respect to the valve stem and engages a valve seat 48a inside the housing. The threaded connection between the valve stem and the interior of the valve housing is sealed by a bellows (50a). When the valve is tightened in its closed position, by rotating the valve stem, the valve head will be pressed to the valve seat (48a), and a lifting reactive forces is applied to the thrust cover, rather than to the first cover, as in conventional valves of this type. Thus the sealed contact between the first cover and the flange is not compromised, and sealing properties of the valve are preserved, even after annealing of the copper seal (24a) which may be caused by baking required for cleaning the interior of the valve chamber for high-vacuum applications.
REFERENCES:
patent: 3101094 (1963-08-01), McKenzie
patent: 3759282 (1973-09-01), Kaldenback et al.
patent: 3810486 (1974-05-01), Gutekunst
patent: 4270727 (1981-06-01), Norman
patent: 4421298 (1983-12-01), Kujawslci
patent: 4431159 (1984-02-01), Stubbs
Chambers A. Michael
Huntington Mechanical Laboratories, Inc.
Pressman David
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