Combined stop and control valve

摘要

A combined stop and control valve for turbine installations and in particular a steam turbine in which the bodies of independently operable stop and control valve components are arranged co-axially to one another in a common housing. The stop valve body has a bell-shaped configuration terminating in an annular seating surface and includes a servo piston component operating in a cylinder and an associated pilot valve for controlling steam entry into the cylinder from the steam chamber. The control valve body includes a bulb-shaped head connected to one end of a spindle, and the other end of this spindle terminates in a servo piston component operating in a cylinder and an associated pilot valve for controlling steam entry into the cylinder from the steam chamber by way of a longitudinal bore through the spindle and valve head.