Vacuum-enclosed integral cryogenic valve

Details Vacuum-enclosed integral cryogenic valve Vacuum-enclosed integral cryogenic valve

1995-03-14

1997-01-28

Larson, James

Fluid handling

With casing, support, protector or static constructional...

Jacketed

1376254, 25112911, 25112915, 2513353, 62 507, F16K 3104, F16K 3110

Patent

active

055970095

ABSTRACT:
The present invention relates to an electrically-controlled vacuum-enclosed cryogenic valve including firstly a body receiving the seat for a valve member, and inlet and outlet channels for a cryogenic fluid, the body and the channels being disposed in an enclosure in which a vacuum is created, and secondly a moving valve member whose stem is actuated by moving core and a control electromagnetic winding, a return spring pressing the valve member against its seat in the absence of excitation. In accordance with the present invention, the moving core of such a valve is placed inside the vacuum enclosure which is secured to a a sleeve that separates the moving core from the control electromagnetic winding, which is placed outside the enclosure. Preferably, a bellows that is secured both to the valve body and to the stem implements sealing between the vacuum enclosure and the fluid flowing through the channels. The present invention applies particularly to valves having two or three ports, or to valves for regulating cryogenic fluids e.g. such as liquid helium, nitrogen, oxygen, or hydrogen.

REFERENCES:
patent: 3203628 (1965-08-01), Schoch
patent: 3573863 (1971-04-01), Doors et al.
patent: 5228472 (1993-07-01), Ougiya et al.
"Axially Symmetric Electromagnetic High-Vacuum Tube", B. Sh. Berenshtein, et al, Instruments and Experimental Techiques, No. 1, Jan. 1968, New York, U.S. pp. 165-166.

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