GB711534A - Improvements in and relating to control valves in hydraulic power transmission systems - Google Patents

Abstract

711,534. Multiple-wav valves. VICKERS. Inc. Julv 25. 1950 [July 25. 19491. No. 18521/50 Class 135 A multi-valve unit for use in a hydraulic control system, comprises a plurality of manually-operable valves each controlling its own motor and each comprising a housing having an axial bore slidably mounting a valve plunger, at least one transverse passage intersecting the bore and opening into recesses on opposite faces of the housing and a passage extending across the housing between the faces without intersecting the bore and communicating with the transverse passage through the recesses. As shown in Fig. 7, the multi-valve unit, comprises control valves 10, 12, 14 controlling double-acting motors 162, 168, 174, respectively, a control valve 16 controlling a single-acting motor 180, supply and return connections 18 and 20 and an adapter block 22. The valves 10, 12, 14 each have an axial bore slidably mounting a valve plunger 26, Fig. 1, and are formed with transverse passages 42, 44, 46, 48 opening at their ends into recesses 34, 36, 38, 40 respectively which are arranged to connect with corresponding recesses in adjacent valves. The recesses 36 are connected to a pressure manifold 54, Fig. 5, supplied with pressure liquid through a port 96 and a non- return check valve 105, Fig. 3, in the supply connection 18, and the recesses 34, 38 to return manifolds 52, 56 which open into a chamber 120 in the return connection 20 which is connected to a sump. A pressure-relief valve 108 connects the pressure port 96 to a pressure-relief manifold 70 connected to sump through the chamber 120 of the return connection. Annular recesses 62, 64 in the bore are connected by ports 58, 60 to the associated motor. The slide valve 16, which except for the blanking off of the port 58 is identical with the other valves, slidably mounts a valve plunger 32 in which the recess which co-operates with the annular recess 62 is omitted. The adapter block 22 has through passages 142, 148 in alignment with the transverse valve passages 48 and the relief manifold 70 respectively and houses a non-return check valve 146 connecting the pressure manifold associated with the valves 14, 16 with one or other of the exhaust manifolds associated with the valves 10, 12 through the passage 142. With all the valve plungers in their neutral positions, Fig. 1, the valve transverse passages 48 are unobstructed and function connected through the return connection 20 to sump. On any plunger being moved from its as a bye-pass passage, the pressure port 96 being neutral position the bye-pass passage is interrupted and pressure builds up on the upstream side of the operated plunger to open the check valve 105, and if the plunger is on the right of the block 22, also the check valve 146. Pressure liquid is then directed to one side of the motor associated with the operated plunger and exhausted from the other side thereof. Should the plungers on the same side of the block 22 be operated simultaneously the motors associated therewith will also operate simultaneously but should the plungers be on opposite sides of the block the motor or motors associated with the right-hand plunger or plungers will not move until the motor or motors associated with the left-hand plunger or plungers has or have fully operated. In this case the exhaust from the lefthand motor or motors passes through the manifold 52 or 56, the passage 142 and the non- return check valve 146 to the pressure manifold 54 of the right-hand motor or motors. Any number of valves may be fitted operating a corresponding number of motors, and they may be all double-acting, all single-acting or any combination of the two types. If only individual or simultaneous operation of all the motors is desired, the adaptor block 22 may be omitted from the unit.