Patent GB-999539-A (GB)
Title: Fluid pressure control valve
IPC: F16K11/074
Filed: 1961-10-31
Abstract: 999,539. Valves. W. D. LUDWIG. Oct. 31, 1961 [Nov. 1, 1960], No. 38865/61. Heading F2V. A solenoid actuated multi-way valve 10, Fig. 1, is mounted on a manifold 11 by a ring 14, the manifold having a conduit 12 for the solenoid leads; several interconnected manifolds and valves may be arranged together in a block. The manifold has opposed ports 23, 24, Fig. 7, connected by a passage 25 that opens into a recess 27 in the face abutted by the valve, which recess communicates with a supply inlet at the lower end of a transfer passage 29, Fig. 4, the upper end of which opens into a valve port 30. The latter also connects with transfer passages 31, 32, Fig. 5; passage 32 extends to an opening 33 in a valve seat 34. Interconnection between passages 25, 29 is effected when upon assembly of the valve 10 to the manifold a part of the valve unseats a spring-loaded check-valve. The valve body is made of plastic material. The manifold 11, Fig. 7, also embodies opposed exhaust ports 42, 43 joined by a passage 44 that opens into a recess 46 in the face abutted by the valve, which recess leads to an exhaust port 47, Fig. 1, at the lower end of a passage 48, Fig. 4, in the valve 13 and thence by passages 51, 52 to an opening in the valve seat 34. The manifold 11, Fig. 7, embodies working ports 53, 60, both leading to separate openings in the valve seat 34, the former via passages 55, 57, 58 and the latter by passages 62, 64, 65; each of these paths includes an adjustable flowrate controlling check-valve 59, Fig. 5. The seat 34 extends into a cylindrical port 67 of the valve 10 which also houses a combined oscillating armature and movable valve-closure member 70; the latter has an insert 69 with a cylindrical chamber 71 and an axial bore 72 communicating with the opening 33. A pilot tube 73 is mounted in the bore 72 and extends into the opening 33 to provide a pivot for the member 70. The chamber 71 opens into the valve seat at two places, one for each position of the member 70; the member 70 incorporates an arcuate slot adapted to alternately connect the passages 58, 65 to the exhaust passage 52. The member 70, Fig. 6, has arms 77, 78 and is spring-loaded against a stop 82. In the position shown, the chamber 71, Fig. 5, is connected to the supply passage 58 and hence the port 53; concomitantly the arcuate armature slot connects the passage 58 with the passage 52, whereby port 60 is open to the exhaust port 42. Upon clockwise rotation of the member 70, the pressure fluid supply is connected by passage 65 to port 60, and passage 58 is connected to port 53 and hence exhaust port 43. The electromagnet comprises poles 86, 87, Fig. 6, and a coil 89, Fig. 5, around a core 88, the coil having terminals 91 that co-operate with holes 93, 94, Fig. 7, in the manifold 11, the leads passing through a bore 95 into the conduit 12, Fig. 1. The valve end-cap 106, Fig. 5, is transparent and forms a bearing surface for an upper-armature pivot-button 108 constituting a piston in the chamber 71. The transfer passages in the member 70 communicate with the inner end of the chamber 71 to overcome the tendency of the control fluid to lift the member 70 from the seat 34. In a modification, the member 70a, Fig. 13, is provided with a pair of transfer passages 74a, 75a which taper into the passage 72a as shown. The member 70a has a stub shaft 115 supported in a ball bearing 117 with spring-loaded endthrust members 118, 122. In further modifications, the arms of the member 70 are magnetic, whereby the return spring may be dispensed with, the return action being effected by reversal of the coil current. The armature thrust cap may be adjusted to eliminate end play.