Patent GB-845187-A (GB)
Title: Improvements in or relating to fluid control selector valves
Inventor: HILL HARRY RONALD
IPC: F16K11/065
Filed: 1955-11-23
Abstract: 845,187. Valves. TECALEMIT Ltd. Nov. 23, 1956 [Nov. 23, 1955], No. 33607/55. Class 135. In a selector valve the ported closure member is slidable or rotatable between a thrust plate and a head plate and the sliding faces of the closure member and said plates are lapped flat. In the first example a multiple-way selector valve comprises a terminal block element 1, Fig. 3, a thrust plate 11, a reciprocable sliding closure member 12 and a head plate 15. The plates 11 and 15 are spaced by members 13, 14, Fig. 4, located between which is the closure member 12. The abutting faces of the closure member 12 and the plates 11, 15 are lapped flat. The block 1 has on one side an inlet port 2, Fig. 3, and on the other two working ports 5, 6. The head plate 15 has two exhaust ports 31, 32. In the block 1 vertical passages 23, 24, 25 extend from the ports 2, 5, 6 coaxially with ports 27, 26, 28 in the thrust plate 11. The closure member 12 has keyhole slots 29, 30 and is connected by links to an operating lever pivoted to the block 1 and movable between two positions determined by stops. In one position of the closure member 12 the inlet port 2 is connected to the working port 5 through the keyhole slot 29 and the working port 6 to the exhaust port 32 through the keyhole slot 30. In the other position of the closure member 12 the inlet port 2 is connected to the working port 6 through the keyhole slot 30 and the working port 5 to the exhaust port 31 through the keyhole slot 29. The block 1 has blind passages 36, 37. The passages 23, 24, 25, 36, 37 are counter-bored to receive resilient sealing 0-rings 34, 33, 35, 38, 39 which because of their deformation press the thrust plate 11 against the closure member 12. The 0-rings may be located partly in the block 1 and partly in the thrust plate 11 or in holes in a retaining plate located between the block 1 and thrust plate 11. In a second example, a rotary disc valve comprises a block 40, Fig. 8, having a bore 41 in which is located the thrust plate 47, the rotary disc closure member 48 and the head plate 49 all retained by a screwed cap member 50 through which passes the stem 52 of the actuating handle 51. The block 40 has interconnected alternately used inlets 42, 43, Fig. 9, working ports 57, 59 and an exhaust port 58. The ports 42, 43, 57, 58, 59 lead to passages 45, 46, 57A, 58A, 59A in the block 40 which latter passages are coaxial with passages 60, 64, 61, 62, 63, Fig. 11, in the thrust plate. The closure member 48 has three arcuate keyhole slots 71, 72, 73 and is movable between two positions as determined by a pin 74 and slot 75. In one position the inlet 42 and the working port 57 are connected through the keyhole slot 71 and the working port 59 is connected to the exhaust port 58 through the keyhole slot 72. In the other position of the closure member the keyhole slot 73 interconnects the inlet 43 and the working port 59 and the keyhole slot 72 interconnects the working port 57 and the exhaust port 58. The block 40 has three or more blind bores 67, Fig. 10, which with the passages 45, 46, 57A, 58A, 59A are counterbored to receive the resilient sealing 0- rings 66, Fig. 8, which project into recesses 69 in the thrust plate 47. The deformed 0-rings press the thrust plate 47 against the closure member 48.