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专利名称：GATE VALVE WITH IMPROVED SEAL
ASSEMBLY
发明人：WILLIAM A. ROGERS申请号：US30500D申请日：19701230公开号：US30500A公开日：19720208
摘要：A valve having a body member defining a chamber with first and second ports,and a closure member movable in the chamber over the first port between open andclosed positions to control flow between the ports. A resilient seal is mounted on eitherthe body member or the closure member to seal the valve by bearing against a matingface of the other member when the valve is closed. A backup element is slidablymounted in the valve chamber to provide continuous confinement for the seal as theclosure member is moved away from the closed position toward the open position. Thebackup element fits against the mating face member when the valve is opened to definea substantially continuous smooth surface in sliding contact with the seal and againstwhich the seal is compressed. The smooth surface formed by the mating face memberand the backup element is broken only by a line joint or seam between the member andelement, and the seal passes easily over this joint without distorting or tending toextrude. After the closure member has retracted toward the open position sufficiently topass the seal over the joint so the seal now bears entirely on the backup member, theclosure member is further drawn past the first port to permit flow through the valve.
申请人：WILLIAM A. ROGERS
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