Performance requirements for throttle valves

The flow adjustment range is large, and the flow-pressure difference changes smoothly;

·The amount of internal leakage is small. If there is an external leakage port, the amount of external leakage should be small;

·The adjustment torque is small and the action is sensitive.

The shape of the Choke valve is the same as that of the shut-off valve, except that the shape of the opening and closing parts is different. The opening and closing members of the throttle valve are mostly conical streamline type, and the flow rate and pressure are adjusted by changing the cross-sectional area of the passage. The throttle valve is used to reduce the pressure of the medium in the event of a large pressure drop.

The flow rate of the medium between the throttle flap and the valve seat is so great 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 tip angle of 140-180. This also enables the valve flap to have a large opening height, which is generally not recommended. Throttle under a small gap.