FIELD: steam turbines. SUBSTANCE: proposed steam extraction control system has control diaphragm with rotary ring and nozzle device, servomotor, lever mechanism and tie-rod connected so that one lever mechanism is connected with servomotor and other lever of lever mechanism is connected with one end of tie- rod and its other end is connected with rotary ring of control diaphragm. Connected of lever of lever mechanism with tie-rod in completely closed position of control diaphragm is made at angle found from formula 
where ϕ is angle between lever of lever mechanism and tie-rod, 
is preset ratio of forces applied to rotary ring in completely closed position (Pc) and completely opened position (Po) of control diaphragm, α is angle of turning of lever mechanism and β is angle of turning of rotary ring. EFFECT: improved reliability of control system. 3 dwg
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