throttle valve by valve to change the channel cross-sectional area and flow rate and pressure of the Industrial Valves is called the throttle valve.

( 1) Throttle valve according to structure form, the kinds of throttle valve can be divided into the following types:

( 2) Purpose and characteristics of the throttle valve throttle valve is used to adjust the medium flow rate and pressure, as type throttle valve used for small valves, the adjusting range is larger and more accurate also.

plug type is suitable for medium and small diameter, butterfly type is suitable for large diameter. In recent years, there have been large diameter ( DN500) By the type of throttle valve, it is mainly used for ash water discharge line.

throttle valve is unfavorable for block valves. Because of the disc for throttling for a long time, susceptible to erosion on sealing surface, affect the sealing performance. Type throttle valve use as more in our country, its nominal size DN3 ~ 200, nominal pressure no greater than PN320, working temperature t≤ 450℃。

( 3) Throttle valve structure as throttle valve type refers to as the structure of the throttle valve and globe Industrial Valves is essentially the same, the difference is the throttle valve can adjust action, usually make stem and disc as a whole ( Figure 2 - 62). 。

throttle valve disc has a variety of structural form, window form for larger sizes, plug used in the smaller size, needle used in small size. Is the common characteristic of throttle valve disc at different heights, disc and seat area formed by the shade also correspondingly change, adjust the seat channel and cross-sectional area, can adjust the pressure and flow rate. Throttle valve stem thread and the pitch than the cut-off valve stem thread pitch of small, in order to accurately adjust.

needle valve is mainly used for instrument or light oil sampling valve and exhaust valve. Because the channel is small, easy to jam, should not be used for large viscosity, easy to coking, medium containing solid granule.

cock type and the application of the butterfly Industrial Valves is less, in this not do detailed introduction.

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