Patent ID: 8807165

Claim:
Control valve ( 1 ), in particular angle control valve and double control valve, also as a seat valve and angle seat valve, for extreme control applications with erosive and corrosive media at temperatures of over 500° C. and pressure drops of over 100 bar, preferably for draining or down-regulating for high-pressure hot separators, medium-pressure hot separators and vacuum distillation columns, in particular for hydrogenation, and particularly for coal liquefaction, essentially with a valve housing, an inlet funnel ( 3 ), an outlet funnel ( 8 ) lined with tungsten-carbide, valve seats ( 6 , 7 ) arranged between them, and a valve piston ( 12 ) provided with a control valve head ( 13 ), whereby the valve seats ( 6 , 7 ) and the valve head ( 13 ) consist of solid tungsten carbide, characterised in that the valve piston ( 12 ) and the valve head ( 13 ) are integrally formed and consist of tungsten carbide, the valve head ( 13 ) has a shortened, approximately semicircular ball control contour, or the valve head ( 13 ) has a cup shape with one or several slits ( 21 ), whereby a hollow inner part is directed downstream, centred in the transition from the inlet funnel ( 3 ) to the valve seat ( 6 ), a wall ( 19 ) around the valve piston ( 12 ) protectively projects into the housing cavity, and the flow passage is formed around the wall ( 19 ) and the valve piston ( 12 ) by an approximately semicircular flow contour ( 20 ), or the valve housing, the valve seat ( 6 ) and a package holder ( 14 ) are designed so that an interior cavity continually narrows from the valve inlet to the valve seat ( 6 ), which prevents evaporation upstream of the valve seat ( 6 ), or one or several pressure reduction levels ( 22 , 28 ) are formed in the valve seat ( 6 , 74 ) and/or in the outlet funnel ( 8 ), or the lining ( 26 ) in the outlet funnel ( 8 ) and/or the valve seat ( 6 , 7 ) is braced against the funnel wall or the valve seat support ( 5 ) by means of at least one innovative disc spring ( 27 ), and/or is protected from vibrations by means of a leather wrapping, or at the end of the valve seat ( 7 ) and/or in the outlet funnel ( 8 ) a bed ( 30 ) of tungsten carbide balls ( 31 ) is designed as an alternative pressure reduction level, wherein the hollow inner part of the cup-shaped valve head ( 13 ) is designed conically with the same angle as the expansion of the valve seat ( 6 ).