| 摘要 |
953,858. Valves. T. D. WILLIAMSON Inc. Feb. 22, 1963 [March 12, 1962], No. 7273/63. Heading F2V. A valve plate 16 coacts with sealing rings 14, 15 in dovetail-shaped grooves 12, 13 surrounding flow openings 10, 11 in plates 5, 8 and is movable between open and closed positions by a shaft 19 having a hexagonal bore for reception of an operating key and a hexagonallyshaped outer part on which the plate 16 is so mounted as to be capable of movement by pressure of the controlled fluid to press against the downstream sealing ring. The shaft has annular grooves containing sealing rings on either side of the outer hexagonal part, and the bottoms of the grooves 12, 13 have venting bores 17, 18 for relief of pressure to prevent the rings 14, 15 from leaving their grooves. The housing, which has a lubricant reservoir 9a, carries a bar 25 to facilitate screwing the housing to pipework.
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