Throttle is achieved by changing the channel area of ​​control or regulating media flow and pressure of the valve.

Throttle valve in the pipeline mainly for throttling.The most common is the use of the throttle valve to change the shape made ​​after throttling valve used. But by changing the cut-off valve or throttle valve opening height to be used is very appropriate, because the state media in throttling the flow rate is high, is bound to make the sealing surface erosion, loss of off seal. Also used as a cutting device throttle is inappropriate.

Throttle valve with a variety of shapes, a common:

1. Hook valve, commonly used in cryogenic apparatus expansion valve.

2. Window-shaped valve, suitable for larger diameter throttle.

3. Plug-shaped valve, suitable for small and medium-diameter throttle, the use of more common.