| 摘要 |
981,013. Valves. H. A. ROY. May 3, 1963 [May 11, 1963], No. 17527/63. Heading F2V. In a rotary spherical valve having an inlet 12 and an outlet 14, the rotary ball 24 seats within a pair of annular, spherical surfaced rubber, elastomer or metal seal rings 26 and 28 in sealing and slidable engagement with spherical surfaced valve body seats 54 and 56. During valve assembly, the rings 26 and 28 are rotated upon the seats 54 and 56 to permit the insertion therebetween of the ball 24 via valve housing opening 36. As the ball 24 is forced downward into the bore the seal rings 26 and 28 slide about seats 54 and 56 into the vertical position to surround and contact the ball 54. The ball is rotated by a stem 30 located within a keyed slot 32 against fixed limiting stops (not shown) and is retained in position by bonnet 34 which bears, via thrust washer 46, against stem flange 31. 0-ring seals 62 and 64 are preferably located in annular grooves within seats 54 and 56 and the grooves may comprise merely an axially and a radially extending surface or, if in the upstream seat, may comprise a parallel sided groove to prevent seal ring extrusion under high pressures. The diameter of the seal rings 26 and 28 is preferably less than that of the seats 54 and 56. Where the seal rings are made of metal they may also contain O-rings within grooves 70 and 72. The seal rings may also be constructed with a semicircular, radially extending flange 66 to restrict motion during valve assembly. |
