Importance

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Abstract

An internally piloted shut-off valve for use with cryogenic fluids incorporates a short valve housing with normally closed valve closure means incorporated therein and fluid passages with ports for fluid flow therethrough including an elongated extended stem protruding therefrom on top of which a solenoid operator is received in the stem end opening so as to define a cavity therein housing a large piston interconnected with the valve closure means by an internally piloted concentric tubing disposed coaxially with the stem and, in combination with large piston, comprising valve actuating means which permit the use of conventional solenoid operator and a trickle of cryogenic fluid converted to vapor inside pilot passage of the tubing and supplied to the cavity at atmospheric temperature when solenoid is enerized, creating pressure differential therein capable of maintaining valve open until the solenoid operator is de-energized, allowing valve closing automatically.

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First Claim