Abstract: A valve particularly for controlling the admission of fluid to sectional nozzles of a turbine has a slidable valve sleeve provided with a control face. The valve sleeve is surrounded by a stack of valve rings fixedly held in the sequentially housing. Each valve ring has a circumferentially extending axial extension with which it engages an adjoining valve ring of the stack. Each axial extension has at least one discontinuity to define a port between any two valve rings. Ports associated with different valve rings communicate with different nozzle sections. As the valve sleeve is moved in one direction, its control face equentially opens the valve ports associated with the different nozzle sections.

Abstract: In a combined starting and quick shut-off mechanism, for steam and gas turbines, having a valve controlled by pressure medium by means of an auxiliary valve the valve has a secondary control piston and a counterpressure closure upon opening as well as an adjustable damping which is adjustable by means of a flow cascade from the inlet side of the valve to an outlet chamber, controlled by the auxiliary valve, at the end of the valve spindle, from the inlet side of the valve to the pressure chamber of the valve piston here exists, via a radial piston chamber, stepped in its outer diameter, of the secondary control piston a further flow passage can be provided in the interior of the valve piston, which passage can be shut-off at the step of the radial piston chamber by means of an annularly projecting control collar of the secondary control piston in the open position thereof.