The classification of the brake pneumatic valve and in the main role in the pipeline

brake pneumatic valve is a kind of pneumatic valve, use is very wide average diameter DN of mm or cutting device to choose it, sometimes caliber brake pneumatic valve is used in the small cutting device also. Brake pneumatic valve is closed ( Ram) Along the pathway of the center line of the vertical direction of the pneumatic valve. Brake pneumatic valve in the pipeline mainly used as cut off
according to the structure of the pneumatic valve gate will brake can be divided into pneumatic valve:
( Parallel brake pneumatic valve, sealing surface parallel to the vertical centerline, the two pneumatic valve sealing surface parallel to each other gate. In parallel brake pneumatic valve, with thrust wedge structure for common, most often in both two gate with double side thrust wedge, the brake pneumatic valve is suitable for the low pressure of medium and small diameter ( DN - mm） Pneumatic valve gate. A between the two gate there is spring, spring can be preloaded force, is advantageous to the disc sealing.
( Pneumatic wedge gate valve, sealing surface and vertical centerline into some sort of perspective, namely two pneumatic sealing surface into a wedge gate valves. Sealing surface Angle generally have a ° & acute; °,朴归隐者; , °, °, °, such as Angle mainly depends on the size of the medium temperature. Generally the higher the working temperature, from the point of view should be more big, to reduce the temperature change occurs when the possibility of a wedge.
each have their advantages and disadvantages of things, the following will describe the advantages and disadvantages of pneumatic valve gate





advantage


shortcomings




fluid resistance is small; Open and close the required external force is small.


opening and closing process, has the relative friction sealing surface, easy to cause scratches.




the flow of medium is not restricted.


brake pneumatic valve is generally has two sealing surface, adds some difficulties to machining, grinding and maintenance.




is wide open, the sealing surface erosion by working medium is smaller than by the pneumatic valve; Is relatively simple, the casting process is better.