DOUBLE-ACTIVE SAFETY VALVE Russian patent published in 2002 - IPC

FIELD: special-purpose engineering; space engineering, for example. SUBSTANCE: double-acting safety valve has piston with seal closing flow-through opening in body and rods secured as cantilevers. Rods are embedded at one end in valve body and their free ends rest bendably against piston, thus forming plastic hinge articulation as soon as preset level of pressure of operation of safety valve has been attained and piston has been released. Rods are mounted at both ends of piston in such way that pressure acts on one or other side, safety valve operates at similar or different magnitudes of operating pressure due to difference in number, sizes of cross-section, length or material of rods at different ends of piston. EFFECT: reliable protection of valve body against damage under action of great excessive pressure both internally and externally. 3 dwg