Patent GB-525774-A (GB)
Title: Apparatus for the distribution of fluids under pressure
IPC: F16K11/07
Filed: 1939-02-28
Abstract: 525,774. Fluid-actuated valves. MAIRE, C. A., and BOURSET, R. A. Feb. 28, 1939, No. 6598. Convention date, March 3, 1938. [Class 135] A distributing apparatus for supplying fluid under pressure to a number of operating cylinders comprises a number of combined slide and poppet valves corresponding to the number of operating cylinders, each slide valve being actuated by a piston to which fluid is supplied by a control device, the admission of such fluid pressure to successive pistons being delayed by throttling valves in the conduits connecting the cylinders with the control device. As shown in Fig. 2, the distributer has a casing 1 with a connection O to a source of fluid pressure, and connections I, II to two operating cylinders (not shown) the supply of pressure fluid to which is controlled by piston valves 25, 48 respectively. The valve 25 has sets of ports 27, 28, and its lower closed end 29 carries a lift valve portion 291 which is pressed against a fixed seat 30 by a spring 31. The piston valve 25 is operated by a piston 18 in a cylinder 17. The chamber 21 below the piston is always open to the atmosphere through an orifice 22 and contains a spring 19 which presses the piston to the upper end of the cylinder. The piston 18 carries on its underside a ported tubular valve 24 sliding within the valve 25. A packing washer 18<SP>1</SP> below the piston 18 co-operates with the end 25<SP>1</SP> of the valve 25 and eventually with a fixed seat 26'. Fluid under pressure is admitted to the chamber 20 above the piston 18 through a conduit 14 under the control of the hand-operated control device in Fig. 4. The latter comprises a grooved piston 7 with a push-piece 8 operating in a body 4 which is connected by conduits 3, 11, which may be flexible, respectively to the source of fluid pressure via a passage 2 and the connection 0 in the body 1, and to the conduit 14. The piston 7 is pressed upwardly by a spring 9 so that the conduit 11 and hence the chamber 20 is normally connected with the atmosphere by a port 15. When the piston is depressed however the conduits 3, 11 communicate by way of the groove 16 to the piston. The construction and arrangement of the second piston valve 48 and its operating piston 40 is precisely similar to that of the valve 25 and piston 18 except that the piston 40 has a nose 41 which in the idle position closes the lower end of a conduit 33 which is permanently connected with the conduit 14 by a passage 32. The other end of the conduit 33 is in restricted communication with the chamber 42 above the piston by an adjustable opened plug lift valve 35 and a restricted passage 55. Similarly pressure fluid is supplied to the operating pistons of any other slide valves past similar throttle valves and restricted passages via a conduit 32<SP>1</SP> which is a continuation of the passage 32. On operation of the thumb piece 8, pressure fluid is admitted directly to the piston 18 and operates the same whereas the fluid is admitted to the piston 40 and any other pistons with an adjustable delay determined by the throttle valves 35. The full pressure is admitted to the chamber 42 only after the pressure therein has built up sufficiently to remove the nose 41 from the passage 33. A passage 64 is provided for the escape of any residual fluid in the chamber 42 such passage being connected with a vent opening 65 by a spring-loaded grooved piston 59 when the piston 18 is raised. When the piston 18 is lowered, the groove 60 lies opposite a second vent opening 66 whereby leakage along the valve 59 from the chamber 20 is prevented from reaching the chamber 42.