| 摘要 |
Particularly when solid particles are suspended in the fluid, even in high concentrations, fluid flows are regulated in free-flow valves through which the flow is axial. In order to keep the flow path essentially without deviations so as to achieve regulation of the fluid flow down to complete shut-off, where the gap between the sealing cone and the sealing seat is not to serve as the regulating element in the significant regulating range, and so as to be able to exchange all those parts of the regulating valve which are subject to wear in a simple and economical manner, the invention proposes to provide in the inlet of the regulating valve a non-displaceable flow-guiding and sealing body (16) which has a downstream extension (16.3) which is overlapped by an axially displaceable tube (20), the inlet end of which has an inflow nozzle (22) with a shape similar to a Laval nozzle, the regulating gap being formed between the Laval nozzle-like contour and the downstream end of the sealing-body extension. The flow-guiding and sealing body (16) is furthermore provided with the sealing seat (16.2) and the inlet nozzle (22) with its Laval nozzle-like contour with the sealing ring (22.1), the two finally resting against one another in a sealing manner when the valve is shut off. The flow-guiding and sealing body (16) is furthermore placed between the flanges of the valve inlet, which have a recess corresponding to the outer ring (15) of the flow-guiding and sealing body. <IMAGE>
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