AIR OPERATED SAFETY SHUT-OFF SYSTEM FOR LIQUID RESERVOIR FEED

摘要

1399584 Fluid-pressure servomotor systems BALDWIN-GEGENHEIMER CORP 13 July 1973 [15 June 1973] 33580/73 Heading G3P [Also in Division F2] The liquid level in a container is normally controlled by a float-operated valve 18 but if the liquid reaches a dangerously high level a floatoperated valve 50 opens to de-pressurize an air line 44 allowing a spring-loaded cut-off valve 16 to close to stop further supply of liquid to the container. The air supply is fed via a pressure regulator 34 and an adjustable needle valve 36 to a plenum chamber 38 and thence to the floatoperated valve 50. A control feed is also taken from the chamber 38 via a line 40 to operate a further valve 46 controlling supply of air to a horn warning device which sounds when the valve 50 is operated. In a system having more than one container fed through a single shut-off valve 16, each container has a float-operated valve 50. Alternatively, each container may be fed through its own shut-off valve 16 controlled by a floatoperated valve 50. The system may be used for controlling the supply of alcohol to'the inking system of a printing press.