VENTIL

摘要

1446363 Valves REXNORD Inc 9 Jan 1974 [11 Jan 1973] 01113/74 Heading F2V [Also in Division G3] A valve unit which can act as a pressure reducing valve with the valve member 40 disposed as shown or a pressure relief valve if the valve member is disposed in an inverted position relative the housing. The housing is formed in two parts 12, 14 which are bolted together and hold a seat 58 therebetween. In the pressure reducing valve disposition of the valve member a spring 60 biases the valve member open so that flow takes place between an inlet 24 and an outlet 38. An adjustable throttle 114 having an axial bore 116 and radial bore(s) 118 accomplishes the majority of the pressure drop between the inlet and outlet while the remainder of the pressure drop takes place over the variable throttle formed between the tapered surface 536 of the valve member and the seat. If the valve member is taken out of the housing and inserted in an inverted position spring 60 biases the valve member to a closed position in which surface 53a cooperates with the slot. If the port 38 acts as inlet and port 24 as outlet the valve unit functions as a pressure relief valve. The two ends of the valve member are formed as pistons 42, 44 which slide in chambers 46, 48 that are interconnected via passages (108) (111) and removable throttles (106) (110). Chamber 48 may be connected to the inlet or outlet via passages 100 which can be plugged. A solenoidoperated pilot valve 86 and a pilot pressure relief valve 68 with an adjustable bias can be connected to the valve unit and can operate the valve by connecting chamber 46 to vent via passages 85, 96 and 98 and passages 84, 82, 78 and 77 respectively.