CONTROL DOUBLE-SEAT VALVE FOR CONTROLLING STEAM FLOWRATE Russian patent published in 2000 - IPC

FIELD: systems for controlling operation of steam turbines, namely organs for sustaining steam pressure. SUBSTANCE: control double-seat valve includes shutter arranged in its body and having upper and lower plates. Shutter is operated by means of servomotor with the aid of rod. In order to equalize pressure values in chambers over upper and under lower plates of valve, shutter is provided with means for equalizing pressure in the form of one equalizing tube arranged between plates concentrically relative to valve axis, rigidly joined with plates, detachably joined with rod and connecting over-plate chamber with under-plate chamber. Shutter may have two equalizing tubes arranged symmetrically relative to valve axis between plates, tubes may be rigidly joined with plates for mutually connecting said chambers. In the whole range of valve opening chambers are always mutually communicated by means of equalizing tube in order to equalize pressure difference between chambers occurred in predetermined opening modes of valve and to reduce pulsations of valve. EFFECT: enhanced controllability of valve in opening range, simplified process of steam pressure controlling. 3 cl, 1 dwg