FIELD: machine building.
SUBSTANCE: invention relates to power engineering. Unloaded control valve, mainly for steam turbines, contains a valve box, valve box cover, slide valve with discharge cylinder, diffuser seat, guide glass and stem. Discharge cylinder of the control valve is separated from the slide by a hollow cylindrical sleeve, of smaller diameter than the guide cup, and the guide glass in its lower part is made with longitudinal windows, and the total area of the windows is not less 70% of the total area of the cylindrical surface of the protective cup where these windows are made. Besides, in the lower part of the sleeve that connects the valve spool to the discharge cylinder, a centring disk is provided, that ensures alignment of the valve spool with the longitudinal axis of the guide cup at all valve positions.
EFFECT: invention is intended to reduce the hydraulic resistance in the steam system to steam turbines while simultaneously increasing the reliability of the unloaded control valves.
1 cl, 6 dwg
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