Brake summary of pneumatic valve

brake pneumatic valve is closed ( Ram) Along the pathway of the center line of the vertical direction of the pneumatic valve. Pneumatic valve gate mainly for cutting in line.
brake pneumatic valve is a kind of pneumatic valve, use is very wide diameter DN of mm or cutting device are usually choose it, sometimes caliber brake pneumatic valve is used in the small cutting device also.
pneumatic valve, the gate has the following advantages:

fluid resistance is small.
open and close the required external force is small.
the flow of medium is not restricted.
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.

also has shortcomings, brake pneumatic valve:

the dimensions and open height is larger. Install the required space.
opening and closing process, has the relative friction sealing surface, easy to cause scratches.
brake pneumatic valve is generally has two sealing surface, adds some difficulties to machining, grinding and maintenance.

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. The sealing surface Angle generally have ° ', ° ', °, °, ° etc. , 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.

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