Patent GB-864143-A (GB)
Title: Combination valve for fluid flow control
IPC: F16K11/044
Filed: 1959-05-04
Abstract: 864,143. Valves. ARO EQUIPMENT CORPORATION. May 4, 1959 [May 5, 1958], No. 15263/59. Class 135. [Also in Group XXVIII] A fluid flow control valve A in a liquid gas converter system comprises a casing 30 having interconnecting ports 34, 68 at one end thereof one of which extends axially along the easing and opens into that end, a valve 50 biased towards the said end and normally closing the connection between the ports and provided with an actuating stem 58 disposed within the port 68, a second pair of interconnecting ports 82, 86 at the other end of the casing, and a second valve 92 which is biased towards the said one end of the casing to normally close the connection between the ports 82, 86 and is connected by an actuating rod 59 with the valve 50. The port 68 is adapted for connection with a fluid supply nozzle which engages the stem 58 for simultaneously moving the valves against their biasing forces. As shown, the system comprises an insulated container 10 for liquefied gases connected with ports 34, 82 of the valve A by conduits 12, 18 respectively, and port 84 of the valve is connected by a conduit 20 with a pressure-closing valve C. When the system is operating liquid flows from conduit 12 through a conduit 14 to the demand and to ensure such flow gaseous pressure is applied to the top of the container through conduit 18, this pressure being exerted by vaporized gas generated in a coil B. The valve casing 30 is divided by a transverse wall 32 into chambers 44, 88 the wall containing a sealed opening 33 and carrying an insert 38 in which is mounted the valve 50 biased by a spring 56 on to a resilient seating ring 42, the actuating stem 58 extending into the port 68<SP>1</SP>. The rod 59 is axially slidable in the insert 38 and extends into and contacts the valve 50 and through the opening 33 to connect with and support the double-acting valve 92, a sealing bellows 61 of brass being sealed respectively in the opening 33 and to the rod 59. Depression of the valve 50 establishes communication between the inlet port 68 and the port 34 via openings 46. The valve 92 seats against either of the resilient seats 100, 105 in chamber 88 and a spring 93 within the valve provides resilient force against the valve when seated against seat 105 ; normally, the valve is biased on to the seat 100 by a spring 108 to isolate the ports 82, 86.  The inlet nozzle comprises a pipe 136 slidably mounted within a cylinder 135 surrounded by a casing 134 and biased outwardly by a spring 137 and terminating in a bulbous member 138 fitting within the inlet 68, there being slidably disposed within the pipe a spring-biased piston 140 adapted to engage the head 35 of the valve 50. The nozzle is locked to the adapter 60 of the valve casing by bayonet pins 146 co-operable with slots 148 in the adapter. A cap having an internal flange is screwed on to the adapter 60 to close the port 68 when the valve A is not in use. In operation, and when the container is to be filled, the cap is removed and the nozzle is connected to the adapter 60 so that the piston 140 depresses the head 35 of the valve 50 to move the latter off the seat 42 so that liquid flows from the pipe 136 to the port 34 connected via the conduit 12 to the container 10. Simultaneously with opening of the valve 50 the rod 59 unseats the valve 92 thus closing port 84 and permitting ports 82, 86 to intercommunicate ; as liquid enters the container, air or other substance in the top of the container flows through conduit 18 into port 82 and out of the vent 86 to atmosphere. When the container has been filled the nozzle is removed to allow the valves 92, 50 to close ports 86, 68 and put port 82 into communication with port 84.