CONTROL VALVE FOR STEAM TURBINES WITH ZERO STEAM LEAKAGE ALONG THE STEM AT FULLY OPEN Russian patent published in 2021 - IPC F16K1/48 F01D17/10 

FIELD: power engineering.

SUBSTANCE: invention relates to the field of power engineering. The control valve for steam turbines contains a valve box, a valve box cover, a spool, a diffuser seat, a valve stem, an axle box. The valve stem from the side of the axle box is equipped with a rigidly fixed locking disc, on the surface of which an annular protrusion with a rounded surface is made on the side of the contacting axle box, and an annular saddle in the form of a corresponding annular recess is made on the contacting surface of the latter. The valve is equipped with spherical washers located between the cylindrical heads of the half-couplings, constituting a flexible coupling connecting the end of the valve stem to the actuator stem.

EFFECT: elimination of steam leakage along the stem when the valve is fully opened.

1 cl, 1 dwg