By the pneumatic valve characteristics, classification, structure principle

characteristics, by the pneumatic valve is
stop pneumatic valve pneumatic disc along the center line of the pneumatic valve seat mobile pneumatic valves, the pneumatic valve is mainly used as cut off in the pipeline.
as of pneumatic valve has the following advantages:
) In the process of opening and closing small pneumatic valve sealing surface friction than gate, wear-resisting.
） Small open height. ( Usually the DN / - /
） Usually only a pair of sealing surface, good manufacturing process, easy to maintenance. Used by the pneumatic valve is relatively common, but since the opening and closing torque is larger, the structure length is longer, average nominal size limit below DN mm or less. By the pneumatic valve fluid resistance loss is bigger, the wider use of the pneumatic valve, thus limiting the deadline.
, the classification of the
) According to the position of the pneumatic valve stem thread can be divided into
a. Thread on the pneumatic valve rod by pneumatic valve: stop pneumatic valve pneumatic valve stem thread outside the pneumatic valve body. Its advantage is pneumatic valve stem from medium erosion, easy and smooth, this kind of structure is more common.
b. Pneumatic stop pneumatic valve stem thread: stop pneumatic valve pneumatic valve stem thread in pneumatic valve body. The structure of pneumatic valve stem thread direct contact with the media, are susceptible to erosion, and lubrication. This structure is used for small diameter and temperature is not high.
） According to the channel direction of the pneumatic valve, and can be divided into:
straight through by the pneumatic valve, pneumatic valve once-through deadline, Angle type by the pneumatic valve and three-pass by pneumatic valve, both by the pneumatic valve is usually done after the flow direction of medium change and distribution of media use.
cut-through Angle type once-through ( Y type)