The oil industry, chemical industry, pneumatic valve selection steps

how the oil industry, chemical industry, pneumatic valve selection
in the face of many classification of pneumatic valves and complex working conditions, to choose the most suitable pneumatic piping installation valve products, the first should understand the characteristics of pneumatic valves; Second should master pneumatic valve steps and basis; Moreover should follow the oil industry, chemical industry with the principle of pneumatic valve. Choose pneumatic valves, oil chemical industry: the principle of pneumatic valve port for straight-through type pneumatic valve, fluid resistance small, usually choose as deadline and open media use pneumatic valves; Cock pneumatic valve and ball valve is suitable for reversing shunt with; Easy to adjust flow of pneumatic valve as control flow; Closed with wiping pieces along the sealing surface of sliding pneumatic valves are best suited for medium with suspended particles. The use of pneumatic valves, globe and open media flow channel for straight-through type pneumatic valve, the fluid resistance small, usually choose as a globe with the 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. Second, reversing shunt with pneumatic valves according to the needs of the reversing shunt, this 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 choose cock pneumatic valve and ball valve is 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. Three, the control flow with pneumatic valve usually choose easy to adjust flow of 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. Four, with a medium of suspended particles with 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, butterfly 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 the moment, no matter in the petroleum, chemical industry, or in other industries of the pipeline system, pneumatic valve application, operating frequency and services, to control or eliminate even low leakage, the most important, the most critical equipment or a pneumatic valve. The ultimate control of the pipe is pneumatic valve, pneumatic valve in the field of various industries service is unique and reliable performance.

by sinopec's statistics: petroleum and petrochemical equipment commonly used pneumatic pneumatic valve, pneumatic valve, globe valves, including gate check pneumatic valves, pneumatic ball valve, butterfly valve, pneumatic safety valve, drain pneumatic valve, from the point of purchase quantity, the biggest purchase quantity for brake pneumatic valve, then stop pneumatic valve and ball valve.

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