GB204682A - Improvements in or relating to fluid distributing devices for piston actuated tools, engines or the like - Google Patents

Abstract

204,682. Branda, B. Sept. 30, 1922, [Convention date]. Fluid actuated gears.-A fluid-actuated piston valve for controlling the motion of a piston with definite or indefinite dead points in both directions, or an indefinite dead point in one direction, is provided with four sliding surfaces a - d, Fig. 1, of which the surfaces a, b connect the parts 1, 2 with the inlet 3 or exhaust passages 4, 5, and the ends c, d form auxiliary pistons upon which the main pressure alternately acts through passages 6, 7 to throw the valve when the exhaust pressure upon one or the other of the faces of the heads a, b ceases upon the main piston F, Fig. 2, closing the port 1 or 2. The cylinder E may have separate inlet and exhaust ports. In the construction shown in Fig. 4, the cylinder has separate inlet and outlet ports 12 - 15, the exhaust passages 16, 17 have a common outlet 21. and the heads h, i work in cylinders provided with auxiliary outlets 17, 18, which, should the exhaust pressure before compression on the outer end of either of the heads h, i be insufficient to hold the valve, throttle the exhaust and prevent the complete reversal of the valve until the corresponding exhaust port is closed by the piston M.