The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 07, 1985
Filed:
Dec. 27, 1982
Willard J Sitton, Houston, TX (US);
William L Whaley, Houston, TX (US);
Joy Manufacturing Company, Pittsburgh, PA (US);
Abstract
A valve seat structure adapted to be positioned within each annular seat pocket (37, 36) which is formed about the flow passage (12, 13) adjacent the valve chamber on both the upstream and downstream sides of the gate element of a gate valve. The valve seat structure comprises a metallic seat ring (40) which fits snugly within the seat pocket (36, 37) but has an axial dimension which exceeds the depth of the pocket. The seat ring is formed with an annular notch (49, 50) in the outer corner of the ring at its rear face (48) for accommodating a resilient O-ring (66) therein. In its front face (47) the seat ring is provided with an annular groove (51) coaxial with the ring axis and provided with serrated side walls (51a, 51b). A plurality of passages (55) are formed in the ring with equiangular spacing and extend from the face groove (51) to the corner notch (49, 50). The passages (55) are filled with an elastomer (60 ) which is molded therein to fill the passages and the groove in the front face of the seat ring and is also bonded to the seat ring by an elastomer adhesive. The inner diameter of the face groove is less than the inner diameter of the corner notch such that the upstream seat structure tends to be pressure energized towards the gate of the valve to enhance its sealing effectiveness. The elastomer insert (60) is formed with a rounded face (65) which projects beyond the front face (47) of the seat ring. The annular opening of the groove in the face of the seat ring is formed with bevelled edges (53a, 53b) to provide a widened mouth of the groove which accommodates the deformed and compressed face of the elastomer sealing element when the gate element (16) is disposed in sealing engagement therewith. The accommodation of the elastomer material when compressed against the gate element enhances its resistance to wear and abrasion to extend the life of the valve and the passages (55) filled with elastomer (60) increase the resistance of the elastomer sealing element to being pressure extruded from the seat ring and enhances its sealing capabilities by being pressure energized towards the cooperating sealing surfaces of the valve.