GB254093A - Improved resetting device for regulators operated by a pressure medium - Google Patents

Abstract

254,093. Roucka, E. June 19, 1925. Relay devices.-A servo-motor gear for use in connection with apparatus for regulating any operation and in connection with measuring methods which operate with an auxiliary energy is provided with two separate resetting members arranged in series in the two exhaust passages from the control valve. The Figure shows the invention applied to the actuation of a damper 4 so as to maintain a constant partial vacuum in the flue 2. The damper is actuated by a piston 7 working in a cylinder 8 connected by pipes 38 with a control valve 24. The control valve is actuated by a liquid sealed bell 12 subject to conduit pressure 10 and acting through links 16, 22 and spring-loaded lever 18 and acts to connect a supply pipe 28 to one or other of the pipes 38 while connecting the free pipe 38 to one or other of the pipes 30. The pipes 30 lead into cylinders 40, 42 provided with spring-loaded leaky pistons 44, 46 coupled to conical valves 48, 50 so that part of the fluid flowing through the conduits 30 discharges into the vesrel 60 and thence back to the pump. This enables the resetting device to work according to some other law which would operate were the resetting cylinders connected directly to the conduit 30. Fluid parsing through the piston 44, 46 passes to the resetting cylinders 72, 74, and there acts on pistons 76, 78 connected by rods 90 to points on the lever 18 on opposite sides of the pivot 20. The pistons 76, 78 also act as damping pistons, and to that end are provided with ports 80, 82 more or less covered by plates 94 on tubes 88 adjusted. by discs 84, 86 and held in position by springs 92. Fluid passing over the edges of the cylinders 72, 74 falls into the receptacle 60.