Importance

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Abstract

Sudden increases in fluid pressure which could be injurious to the diaphragm and seals of a sensitive capacitive pressure transducer, or the like, are instantly protectively blocked or 'checked' automatically by a miniature naturally-powered valve having a low-mass one-piece valve member or plug molded of elastomeric material which is shaped and disposed to be immediately propelled into guided tight line-contact seating and sealing as an abrupt pressure surge commences and then to hold such sealing only until the plug is unseated by gravity when either the pressure is rapidly lowered suitably in operation of the transducer or the diaphragm is slowly exposed to increased pressure after enough minute normal valve leakage takes place. A truncated conical valving surface is provided on a mid portion of the movable plug, for line-contacting with the narrow edge of a circular valve-body stationary seat, and tapered and cylindrical guide portions at opposite ends of the mid portion of the plug are trapped within and guided by surrounding inner surfaces of the valve body just upstream and downstream of the seat. Threadedly-united halves of the valve body may be adjustably telescoped to adjust the limits of travel of the valving plug member within them, and, thereby, to adjust or calibrate response characteristics of the valve.

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First Claim