DuPont

A new technology prevents leaks in low-pressure (less than 50 psi) relief valves. To form a tight seal, the valve spring compresses the valve’s O-ring between two planar mating surfaces. Both the valve seat and the sealing surface of the valve head are oriented substantially perpendicular to the valve axis. A pressure differential increases the extent of compression between the resilient valve seal and both sealing surfaces.

The resilient valve seal is an annular O-ring that deforms to a predetermined extent into sealing engagement against both sealing surfaces. When the pressure of a fluid within the vessel exceeds the desired spring biasing force, the valve face lifts from the valve seat to relieve pressure within the vessel. Applications include lab glassware and gloveboxes, or vacuum commercial operations where the content environment must be rigorously controlled.

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NASA Tech Briefs Magazine

This article first appeared in the June, 2014 issue of NASA Tech Briefs Magazine.

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