Patent GB-722782-A (GB)
Title: Improvements in or relating to valves
IPC: F16K11/074
Filed: 1952-12-31
Abstract: 722,782. Rotary disc valves. BARKSDALE, L. S. Dec. 31, 1952, No. 33082/52. Class 135. A multiple-way rotary disc valve for controlling high pressure fluid comprises a body part 12 having passages communicating with four equally-spaced ports 70a, 71a, 72a, 73a opening into a plane 12a, a housing part 10 with a cavity 15 opposite the plane surface, and a valve rotor 30 rotatably mounted in the cavity and comprising spaced parallel plates 31, 32, one of which co-operates with the surface 12a and spaced parallel webs 33 connecting the plates and having passages 100, 101 connecting ports which co-operate with the ports 70a, 71a, 72a, 73a. The body part 12 may be of high tensile material, e.g. hydraulic bronze, and the housing part 10 of cheaper material, e.g. cast iron. The rotor 30 has an actuating spindle 24 rotatably supported in the part 10 which has four tapped bosses 70, 71, 72, 73 for connection respectively to a high pressure fluid supply, to the two ends of a work cylinder and to an exhaust or " return " connection respectively. Passages connect these bosses with four equiangularly spaced ports 70a, 71a, 72a, 73a opening in the face 12a. A central port 94 is also connected by a passage 95 with the boss 73. Each of the ports 70a, 71a, 72a and, if desired, the low pressure port 73a is provided with a wear-resistant sealing ring 82 having a narrow rim 91 pressed against the valve rotor 30 by the fluid pressure acting on different areas at its ends and by a wavy spring washer 86. Each ring 82 has a groove containing a leather washer 85 and a rubber ring 84. The passages 100, 101 in the valve rotor connect pairs of ports 96, 97 and 98, 99 in the valve plate 32 which also has a central port 102 in alignment with the port 94 and a port 103 between the webs 33. The ports 102, 103 allow fluid to pass directly from the inlet boss 70 to the outlet boss 73 when the valve rotor is in its central position. The valve rotor may, however, be reversed with respect to its spindle 24 to prevent this. Movement of the rotor 45 degrees either way from the central position results in one end of the work cylinder being connected to the high pressure and the other to exhaust. The housing cavity 15 has a counterbore 16 adapted to receive ball bearings 17, a retainer ring 18, a thrust washer 20, and shims 21. The side wall of the cavity 15 has a plane surface 10a engaging the surface 12a. Mating grooves 110, 111 in these surfaces form a channel containing a sealing ring 112. The actuating spindle 24 has a head 26 with pins 27 engaging sockets 28 in the valve rotor. The upper end of the spindle 24 receives a detent plate 40, a spacer washer 54, and an operating handle 60, and is made flat sided at 42 to prevent relative rotation between the spindle and the detent plate and the operating handle. The detent plate 40 is held by a snap ring 50 and has an arcuate slot 45 co-operating with a fixed pin 46, and three apertures 47 co-operating with a spring-pressed detent ball 48. The easing parts 10, 12 are held together by screws 13, Fig. 8, and where the valve is panel-mounted these engage long nuts 121 also adapted to receive panel screws 122.