Throttle valve performance requirements

The performance requirements of the throttle valve are: ·The flow adjustment range is large, and the flow-pressure difference changes smoothly; ·The internal leakage is small, and if there is an external leakage port, the external leakage should also be small; ·The adjustment torque is small and the action is sensitive. The shape and structure of the choke valve is no different from that of the stop valve, but the shape of their opening and closing parts is different. The opening and closing parts of the throttle valve are mostly conical and streamlined, and 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 under the condition of extremely large pressure drop. The flow rate of the medium between the throttle disc and the valve seat is very high, so that the surface of these parts is quickly damaged, which is the so-called cavitation phenomenon. In order to minimize the impact of cavitation, the valve disc is made of cavitation-resistant material (made of alloy steel) and made into a streamlined cone with an apex angle of 140-180, which can also make the valve disc have a larger opening height, which is generally not recommended Throttling under small gaps.