Fluid control and shut off valve

Details Fluid control and shut off valve Fluid control and shut off valve

1990-09-12

1992-03-31

Cohan, Alan

Valves and valve actuation

Electrically actuated valve

Having element dimensionally responsive to field

137486, F16K 3102, G05D 706

Patent

active

051001004

ABSTRACT:
An improved control and shut off valve assembly is disclosed. The preferred valve assembly provides sufficient forces to overcome biasing forces so as to provide adequate shut off at a leakage rate of less than 10.sup.-9 std cc/sec of He with an atmospheric differential of Helium applied across the valve seat of the assembly, and precise control of the flow rate, all as a function of a single electrical control signal. In accordance with another aspect the valve seat is made from a material softer than the valve seat engagement means so that the seat is coined by the valve seat engagement means when first used so as to insure tight tolerances for sealing the valve passageway during the shut off mode. Finally, in accordance with yet another aspect of the invention, the valve assembly is constructed with no separate parts within the flow path so as to maintain a clean passageway.

REFERENCES:
patent: 3614486 (1971-10-01), Smiley et al.
patent: 3851526 (1974-12-01), Drexel
patent: 4464932 (1984-08-01), Ewing et al.
patent: 4548075 (1985-10-01), Marino
patent: 4695034 (1987-09-01), Shimizu et al.
patent: 4977916 (1990-12-01), Ohmi

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