The shape structure of the throttle valve is no different from that of the globe valve, but the shape of their opening and closing parts is different. Most of the opening and closing parts of the throttle valve are conical streamline, through which the flow and pressure can be adjusted by changing the cross-sectional area of the passage. The throttle valve is used to reduce the medium pressure in the case of extremely high pressure drop.
The flow rate of the medium between the throttle disc and the valve seat is so high that the surface of these parts is quickly damaged - the so-called cavitation phenomenon. In order to minimize the influence of cavitation, the valve disc is made of cavitation-resistant material (made of alloy steel) and made into a streamlined cone with a sharp angle of 140-180, which can also enable the valve disc to have a larger opening height, which is generally not recommended. Throttling under small crevices.
