STEAM STOP VALVE ASSEMBLY WITH INTERNAL BYPASS VALVES

摘要

A steam stop valve assembly with internal bypass valves for use in controlling the steam supply to a steam turbine. The steam stop valve assembly has a main valve in which formed are a plurality of bypass passages extending in the axial direction of the valve spindle. Steam inlets communicating with respective bypass steam passages are formed in the peripheral wall of the main valve. A retainer member having an inwardly directed recess is attached to the top of the main valve. Between the retainer member and the main valve, disposed is an intermediate member provided at its top surface with a projection which is loosely and slidably received by the recess of the retainer member. The intermediate member is provided with bypass valves adapted for opening and closing corresponding bypass steam passages.