GB1174047A - Valves for Fluid Circuits - Google Patents

Abstract

1,174,047. Digital fluid systems. ARO CORP. 13 Dec., 1966 [13 Dec., 1965; 25 Jan., 1966; 28 June, 1966; 8 July, 1966 (3)], No. 55866/66. Heading G4P. [Also in Division F2] A valve for a fluid logic circuit, e.g. an OR valve shown in Fig. 4, comprises a body having a face adapted to be mounted on a circuit board BP with inlets 1 and 2, and an outlet 3 which are sealed against the board by O-ring seals 44. The body is formed of two parts 10 and 12 which are clamped together, and to the board BP, gasket G, and cover-plate CP, by bolts 14 and nuts 16. Part 10 is formed with a valve seat 26, and part 12 with a seat 28. A resilient valve disc 30 of slightly greater thickness than the distance between the seats, is trapped therebetween. A seal (18), Fig. 5, not shown, is placed between the parts 10 and 12. With no pressure at inlets 1 and 2, disc 30 touches both seats 26 and 28. Pressure from either inlet 1 or 2 will lift the disc from its respective seat and pressurized outlet 3. Fig. 10, not shown, illustrates an AND valve. The body has three parts (45), (46) and (47), the part (46) being formed with seats (55) and (56). A valve member with closure surfaces (64) and (67) and a stem (60), is slidable with clearance in a bore (61). A light spring (66) loads surface (64) into engagement with seat (55). A diaphragm (63) acts to open valve (64), against pressure at inlet (1) and the spring loading, and close valve (67) on the seat (56). An exhaust passage (58) connects with the clearance around the stem (60). Flow through the valve will not take place until both inlets (1) and (2) are pressurized, the pressure at (2) forcing the valve (67) on to its seat to close the exhaust (57) and allowing flow from inlet (1) around the seat (55) to the outlet (3). In Fig. 16, not shown, a NOT valve has three body parts (71), (72) and (73) with valve seats (79) and (82), and a valve closure having surfaces (89) and (90) is mounted on a spindle (85) acted upon by a diaphragm (81). Pressure at an inlet (1) opens valve (79), (89) and closes valve (82), (90), to open a passage to outlet (3) and close an exhaust (84). Pressure at an inlet (2) forces the closure (89) on to seat (79) to close inlet (1) and exhaust outlet (3), Fig. 22, not shown, indicates a MEMORY valve, which is similar in construction to the valve of Fig. 10 but with an orifice (122) connecting passageway (99), from inlet (2), to the space above closure (115) which maintains valves (115), (106) open when flow at (2) is cut off. In Fig. 29, not shown, a DIFFERENTIATOR valve is similar in construction to that of Fig. 16 but with a restricted orifice (142) between parts (1) and (2) and an accumulator chamber (128) above the diaphragm (131). When pressure is applied at (1) to open valve (137), a quantity passes through orifice (142) to chamber (128), until it overcomes pressure at (1) to move valve downwardly and exhaust outlet port (3) through passage (145). In Fig. 35, not shown, a TIMING valve includes an AND valve (153), similar to that of Fig. 10, and a valve (152) having a chamber (150), check disc (170) and an adjustable throttle (176). As pressure builds up in the chamber (150), it acts on diaphragm (180) until it overcomes the pressure acting on the underside of the closure (184) whereupon it actuates the valve to allow a flow through outlet (154).