The throttling performance requirements of the pneumatic valve

throttling performance requirements of the pneumatic valve is:
flow adjusting range is big, smooth flow of a differential pressure change;
in small leakage, if have leaked oil mouth, leakage is also smaller;
, adjust the torque is small,.
throttling pneumatic valve ( Chokevalve) The shape of the structure and the pneumatic valve, there is no difference, they're just the shape of the open-close part is different. Throttling of the pneumatic valve opening and closing a streamlined, most of the cone change channel cross-sectional area and through it to regulate the flow and pressure. Pneumatic valve for throttling in low pressure drop greatly reduce the pressure of medium.
medium velocity between throttling and pneumatic pneumatic valve seat valve is very big, to these parts surface damage soon - the so-called cavitation phenomenon. In order to minimize the cavitation effect, pneumatic disc cavitation resistant materials ( Alloy steel) Made top Angle for ~ streamlined cone, and it also can make the pneumatic valve can have larger opening height, usually under the small aperture throttling is not recommended.
throttling characteristics of pneumatic valve
, structure is simple, easy to manufacture and maintenance, the cost is low.
and regulating accuracy is not high, cannot be used to adjust.
and sealing surface erosion, cannot be cut off the medium used.
poor, sealing.