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1. 发明专利

GB628111A An improved high pressure hydraulic selector valve 未知
公开(公告)号：GB628111A
公开(公告)日：1949-08-23
申请号：GB3532845
申请日：1945-12-31
申请人： LIONEL STERN
IPC分类号： F15B13/06 , F16K11/074
摘要： 628,111. Rotary disc valves. STERN, L. Dec. 31, 1945, No. 35328. Convention date, Dec. 28, 1944. [Class 135] In a rotary disc valve for controlling the supply and exhaust of pressure liquid to a hydraulic motor, the valve disc is enclosed within a chamber communicating with the liquid supply source and is provided on its contact side with a recess covering the greater portion of the contact side and forming part of the exhaust line from the motor, and on its other side with a cylindrical extension passing through the wall of the chamber, and the recess is so shaped that the centroids of the area of the disc subjected to the supply pressure and of the area of the recess lie on the axis of rotation of the disc. An assembly of two valves, each controlling e.g. a double-acting hydraulic ram, is formed by a block 1, Figs. 2, 4, having opposite valve faces 2, hollow casings 3 enclosing chambers 10 in which are located the valve discs 13, and end plates 4, held together by bolts 8 and nuts 9. The cylindrical extensions 15 of the valve discs are slotted to receive operating levers 21 which are pressed against the plates 4 by springs 27, and balls 28 housed in pockets in the levers co-operate with holes in the plates to locate the levers in their neutral position. The chambers 10 are in constant communication through passages 31 with the supply port 30, and the recess 39 in the valve discs are in communication through a passage 32 with the exhaust port 33. Ports 35, 34, Fig. 5, in the block 1 are connected to pipes leading to the ends of the rams, and apertures 40, 41, Fig. 6, in the valve disc enable one of these ports to be connected to the supply and the other to exhaust when one of the levers is moved from its neutral position. The recesses 39 are made as large as possible, covering all the non-functional area of the valve disc and are shaped so that their centroids lie on the valve axis, thus minimising the bearing pressure and ensuring that the valve disc wears evenly.

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