GB1307820A - Fluid flow control valves - Google Patents

Abstract

1307820 Valves H ZADOW and H R J ZADOW 17 April 1970 [19 April 1969] 20072/69 Heading F2V [Also in Divisions F1 and G3] Control of a piston and cylinder unit 32, 33, Fig. 1, is effected with the aid of a primary control valve 1 and two secondary control valves 8 and 9, each of which valves contains a freefloating plate-like valve member 2, 10 and 11, respectively. In the state of the valves shown, fluid supplied to inlet 3 of primary control valve 1 passes through the valve outlet 4, duct 21, ports 14 and 12 of the secondary control valve 8, duct 28 and into piston chamber 30 as a result of which fluid in piston chamber 31 is forced through line 29 and ports 13 and 17 of secondary control valve 9 into exhaust line 26. Upon applying a control signal to port 7 of primary control valve 1, the valve member 2 thereof moves to the opposite side of the valve chamber and fluid from the inlet 3 passes through outlet 5 into duct 23 and so in turn acts to move valve plates 11 and 10 to the opposite ends of the respective chambers of the secondary control valves thereby allowing fluid to be supplied to piston chamber 31 and fluid to be exhausted from piston chamber 30 to exhaust line 25, movement of plate 10 being consequential to movement of plate 11, the latter movement being transmitted through pin 20. Return of the three valves to the state shown in Fig. 1 is achieved by the application of a signal to port G of primary control valve 1. Application of signals to the control ports 6 and 7 of primary control valve 1 may be effected by means of push buttons 101 and 102 which when depressed, move the valve plate, referenced 52 in Fig. 12, through the intermediary of a respective one of two actuator rods 107 and 108. Alternatively, motion imparted to the push buttons 101 and 102 may be transmitted to the respective actuator rods by means of fluid upon which the push buttons act and which in turn acts on the ends of the actuator rods remote from the valve plate (Figs. 13 and 15, not shown). In a further modification (Fig. 14, not shown), the actuator rods 107 and 108 may be dispensed with in which case movement of the valve plate consequent to depression of the push buttons is achieved through the intermediary of fluid only. Continuous reciprocation of the piston is achieved by connecting thereto tappets 109, 110 which at the end of each stroke of the piston depress the respective push button 101 or 102 in consequence of which the valve plate of the primary and hence also the valve plates of the secondary control valves are moved and the supply to and exhaust from the piston and cylinder is reversed. The double acting piston may be substituted by a spring-biased single acting piston in which case only one secondary control valve is used (Fig. 4, not shown). Instead of a generally cylindrical valve chamber and correspondingly shaped valve plate various other configurations of one or both are envisaged (Figs. 8, 10, 16, not shown). For example, the chamber and associated plate may be elongated or the chamber may be wedgeshaped.