Valve assembly having improved valve seat

专利名称：Valve assembly having improved valve seat发明人：Daniel P. Kusmer,Robert A. Frenzel申请号：US08/253337申请日：19940603公开号：US05388806A公开日：19950214

摘要：A valve comprising a valve body having a first end, a second end, and a throughopening forming a fluid flow passage and a wall surrounding a portion of the fluid flowpassage, the fluid flow passage defining an axis that is co-axial with the wall. A valveelement is rotatably mounted in the valve body, the valve element having an annular,radiused sealing surface and being rotatable around a second axis perpendicular to thefirst axis passing through the fluid flow passage. A valve seat assembly is disposed in thevalve body for sealing engagement with the sealing surface of the valve element, thevalve seat assembly being axially displaced from the second axis toward the first end ofthe valve body, the valve seat assembly comprising a seal ring of a resilient, plasticmaterial and having an annular radially inwardly facing first surface for sealingengagement with the sealing surface on the valve element and an annular, radiallyoutwardly facing second surface, an annular radially outwardly facing groove beingformed in the second surface. An elastomeric backing ring is disposed in the groove, thebacking ring being circular in cross-section and having a center-line defined by a firstplane passing through the center of the backing ring perpendicular to the first axis, theengagement between the sealing surface on the valve element and the first surface onthe seal ring being substantially annular, line contact when the valve element is in the

closed position and in the absence of any fluid pressure acting on the valve element, theline contact engagement lying in a second plane axially displaced from the first plane in adirection away from the second axis toward the first end of the valve body. There are alsoprovided retaining means for retaining the valve seat assembly in the valve body.

申请人：KEYSTONE INTERNATIONAL HOLDINGS CORP.

代理机构：Browning, Bushman, Anderson & Brookhart

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