SERVOMOTOR FOR STEAM-TURBINE CONTROL VALVE ACTUATOR Russian patent published in 2001 - IPC

FIELD: thermal engineering. SUBSTANCE: servomotor has piston and two rods passed through opposite ends of housing; one of rods functions to directly control one valve and other rod, to control at least one more valve through leverage. Servomotor rods are installed in opposition to one another in drain cavity with interacting contact surfaces through their end members at distance depending on desired surface area of valve operation. One of rods is fixed to piston and other one is provided with supporting disk and both of them support reset springs concentrically mounted in drain cavity. Proposed servomotor provides for controlling several valves via simple ties without mounting reset spring assemblies on valves proper. EFFECT: enhanced reliability of control- valve actuator. 1 dwg