Pipe pneumatic valve selection

the pipe is the ultimate control of pneumatic valves, pneumatic valve opening and closing a control flow of the medium in the pipe bundle, the shape of the pneumatic valve flow pneumatic valves have a certain flow characteristic, in choosing pipe system is most suitable for installation of the pneumatic valve must consider this.
the following for selecting pneumatic valves should follow the principle:
(1) by the use of pneumatic valve and open media
port for straight-through type pneumatic valve, the flow resistance is small, usually choose as by use of pneumatic valve and open media. Down close type pneumatic valves ( Stop pneumatic valve, plunger valve) Due to its port twists and turns, flow resistance is higher than other pneumatic valve, therefore, less to choose. At higher flow resistance is allowed in the occasion, can choose close type pneumatic valves.

2 control flow with pneumatic valve usually choose easy to adjust flow pneumatic valve as control flow. Down close type pneumatic valves ( If by the pneumatic valve) Suitable for this purpose, because it has a pneumatic seat is proportional to the relationship between size and shut down a trip. Rotary pneumatic valves ( Cock pneumatic valve, butterfly valve, pneumatic ball valve) And the deflection pneumatic valve type pneumatic valve ( The clamping pneumatic valve, pneumatic diaphragm valve) Can also be used to throttle control, but usually only in a limited range of pneumatic valve diameter. Pneumatic valve with disc brake disc on circular pneumatic seat do transverse movement, it is only when nearly closed position, in order to better control the flow, so don't usually used for flow control.

(3) the reversing shunt with the pneumatic valve according to the needs of the reversing shunt, the pneumatic valve can have three or more channels. Cock pneumatic valve and ball valve is suitable for this purpose, as a result, most of the pneumatic valves are used for reversing the shunt to choose one of this kind of pneumatic valve. But in some cases, other types of pneumatic valves, pneumatic valves as long as the two or more properly connected each other, also can use for reversing shunt.
(4) medium with suspended particles with a pneumatic valve
when with suspended particles in the medium, the most suitable for adoption it down along the sealing surface of sliding with wiping the pneumatic valve. If shut down parts of pneumatic seat back and forth movement is vertical, then can clamping particles, so unless this pneumatic valve sealing surface material allows embedded particles, otherwise only applies to basic cleaning medium. Pneumatic ball valve and plug in the process of the pneumatic valve in the opening and closing of sealing surface are all in the wiping and therefore suitable for use in medium with suspended particles.
at present, whether in the petroleum, chemical, or in other industry pipeline system, pneumatic valve application, operating frequency and services, to control or eliminate even low leakage, the most important, the key equipment for pneumatic valves.