Patent ID: 8678034

Claim:
A quick acting control valve for a steam turbine, comprising: a valve box; a control valve cone; and a quick acting valve piston, wherein the control valve cone is arranged in the valve box so as to be displaceable along a first center axis of the control valve cone, as a result of which the control valve cone may be moved into an open position in which the control valve cone, with a control valve cone surface, is lifted off the valve box, and into a closed position in which the control valve cone abuts against the valve box with the control valve cone surface, wherein the quick acting valve piston is arranged in the valve box facing a back of the control valve cone remote from the control valve cone surface and, on an outer peripheral edge of the quick acting valve piston, always abuts against the valve box in a steam-tight manner and includes a passage, through which steam may pass from a side of the quick acting valve piston remote from the control valve cone to the side of the quick acting valve piston facing the control valve cone, wherein the quick acting valve piston is arranged in the valve box so as to be displaceable in parallel with the first center axis of the control valve cone and is thereby able to be placed against the back of the control valve cone, as a result of which a through-flow of steam from the steam inlet opening to the steam outlet opening is prevented wherein the first center axis of the control valve cone and a second center axis of the quick acting valve piston coincide, and wherein the control valve cone includes a control valve spindle and the quick acting valve piston includes a quick acting valve spindle, and wherein the spindles are longitudinally displaceable in parallel with the first center axis and the second center axis.