GB1027633A - Improvements in or relating to fluid control valves - Google Patents

Abstract

1,027,633. Valves. ELECTRO-HYDRAULICS Ltd. June 6, 1963 [June 14, 1962], No. 22993/62. Heading F2V. A rotary-disc valve has a ported plate 1, Fig. 1, over which slides a ported rotor 2 in a housing 5 secured to the plate. An operating spindle embodies detents 7 which are engageable by a spring-loaded ball 8 to hold the rotor 2 in any selected position. The plate may co-operate with a body having a standard arrangement of passages connected to a pressure supply, such as two sources of different pressure, a tank and a service, e.g. a fluid-pressure actuated ram. The body 11 (Fig. 2, not shown) is provided with seven passages C-J; C, D are connected to a high-pressure supply, E, H lead to the rod side of the ram, F is open to the full-area side of the ram, G is connected to the tank and J to the low-pressure supply. Any one of a number of plates may be used each having a different arrangement of porting; the plate 12 may have five openings so that both passages D, E are closed. Any one of a number of differently ported rotors may be employed, out of which 13 (Fig. 3, not shown) embodies a curved slot 14 and two ports 15, 16 whereby a double-acting ram is controlled; this rotor seals the passage J. The port 15 may be extended as a radial slot so that the ram is operated in opposite directions by the different pressures. A different valve plate and rotor are employed to extend the ram by simultaneously applying the two different pressures to opposite sides thereof. In each of the embodiments, both'sides of the ram are connected to tank when the rotor is in the neutral position. The rotor may be urged on to the plate or body by a light spring and by pressure balancing since the high-pressure port C is never covered by the rotor.