Mehrwegedrehschieber

摘要

1,183,534. Valves. UNIVERSAL OIL PRODUCTS CO. 5 June, 1967 [9 June, 1966], No. 25802/67. Heading F2V. A rotary disc selector valve comprises a stator 11, which has formed therein twenty-four ports 25 equally spaced around the circumference, and five concentric circular grooves A, B, C, D and E, and a rotor 15 which is biased on to the stator by fluid pressure applied through duct 24 and has five crossover tubes (27, 28, 29, 30, Figs. 2 and 3, not shown) and 31 each one communicating with one groove and one of five ports (32-36, Fig. 3) spaced around the circumference of the rotor, each of the grooves being supplied with fluid through a line 26 such that it can be transferred from the groove, via the corresponding crossover tube to corresponding port in the rotor and hence to the selected port in the stator. Disposed between the stator and rotor, and fixed to the latter, is a plastics liner 16 having formed therein five apertures to correspond with the rotor ports and nineteen recesses 50 each one corresponding to one of the non-selected stator ports, the recesses being of slightly larger diameter than the stator ports and being positioned slightly radially inwardly toward the axis of rotation of the rotor. Within each such recess there is mounted a relatively rigid plate-like reinforcing member 51 comprising a metallic or hard plastics plate 53, which may be perforated, secured to the rotor 15 by machine screws 55 and coated with a layer of plastics material, the outer surface 56 of the plate 15 being spaced inwardly from the surface 57 of the plastics liner 16. Rotation of the rotor, as by shafts 17 and 22 coupled together by a flexible coupling member 21, brings each groove into communication with one stator port, the remaining stator ports being covered by the recesses which, by virtue of their construction, serve to prevent distortion of the liner 16 at or over these non-selected ports. In an alternative embodiment (Figs. 7 and 8, not shown) there is provided in the region of and directly over each reinforcing member 51, a set of passageways (71) which communicate with a central pressure relief vent (72), extending through the member, the arrangement serving to minimize deformation of the liner as due to accumulation of pressure between the liner and rotor.