GB474299A - An improved automatic regulating apparatus for a gas compressing installation - Google Patents

Abstract

474,299. Regulating compression. HEYWOOD, C. F. April 28, 1936, No. 12074. Convention date, April 29, 1935. [Class 8 (i)] A single compressor supplies a number of reservoirs working at different pressures, the compressor automatically supplying each reservoir as soon as a certain quantity of air has been withdrawn therefrom and at other times working under no load. Fig. 1 shows reservoirs 5, 6 adapted to supply air for braking and for starting the Diesel engine of a vehicle, supplied from a two-stage compressor 1. Each reservoir has a control device 43 comprising a valve operated by a Bowden wire 43a for supplying air from the reservoir, and an inlet valve regulated for the desired pressure controlling the supply from one of the compressor stages. Piston valves 12 in a regulating device 10 are subject on their lower faces to the reservoirs and on their upper faces normally to atmospheric pressure and to the delivery pressure of one of the reservoirs through pipes 44a, 46a. When both reservoirs are filled, the valves in their upper positions allow the air from the first stage to pass through grooves in the valves to the atmosphere by a passage 10c, while the air from the second stage is byepassed through a pipe 2e. In modifications, ball valves replace the piston valves. Fig. 5 shows one of three reservoirs supplied by branches 2 from a common compressor discharge line through ports 49a in pistons which are forced up by the internal pressure when the filling is completed, and so close the valves. When air is drawn off by opening a valve 50a, a pipe 51 leads air to the top of the corresponding piston valve, allowing the port to be re-opened. A branch from the pipe 51 acts on a ported piston controlling an outlet to atmosphere for the compressor.