Method of control, by the movements of the main valve of the adjustment, the valves of an overload of the machines for steam and mainly of steam turbines

摘要

8977. Kilburn, B. E. D., [Sulzer, Geb.]. April 11. Regulating.-In apparatus for controlling the by-pass or overload valves in steam turbines through a servo-motor by the movement of the main regulating-valve, a part of the movement of this main valve is employed to move a piston valve, which controls the flow of fluid to the piston valve of the servo-motor. The spindle A of the main regulating-valve moves a piston C by means of a spring B, and connects a passage F to the source of liquid under pressure through a pipe E. A valve K in the servomotor piston J is thus raised against the action of a spring L, and thereby connects the spaces P, O below and above the servo-motor piston respectively. Pressure fluid thus flows through pipes M, N, Q, R to the exhaust S, and since the pipe N is of sufficiently small cross-section to reduce the pressure of the liquid entering the space O, the servo-motor piston is raised, and the by-pass valves are operated by the stem H. Specification 12,213/09, [Class 57, Governors &c.], is referred to.