BI-DIRECTIONAL VALVE FOR CRYOGENIC FLUIDS

摘要

This invention is directed to a valve adapted for bi-directional thermally responsive sealing means having a pair of spaced bead-like projections for engaging a valve disc in leak-proof fashion. The bidirectional seal is provided with means for mechanically loading the sealing means for maintaining a substantially constant pressure on the sealing means to provide an essentially constant sealing load with temperature changes.