As a common classification and selection guide of pneumatic valve

the commonly used as pneumatic valve, pneumatic valve has a once-through cut-off Angle type by the pneumatic valve, pneumatic valve plunger deadline, their characteristics are as follows.
） Once-through deadline pneumatic valve: in a once-through or Y stop pneumatic valve, pneumatic valve flow channel and the mainstream way into a diagonal lines, so that the flow state damage than conventional stop pneumatic valve is small, so the instrument pneumatic valve through the pressure loss and the corresponding small.
） Angle type by the pneumatic valve: in Angle type by the pneumatic valve, fluid change a direction, that through this instrument pneumatic valve pressure drop is smaller than conventional structure of the pneumatic valve.
） Plunger deadline pneumatic valve: this form by the pneumatic valve is normal as variant of pneumatic valve. In this instrument pneumatic valves, pneumatic disc and seat is usually designed on the basis of the principle of plunger. Pneumatic polishing disc pillars plug connected to pneumatic valve stem, seal is set in the column inserting two elastic sealing ring. Two elastic sealing ring with a set of rings is separated, and through the air valve cover nut to the load of the pneumatic valve cover pressed around the plunger seal. Elastic sealing ring can be replaced, can use a variety of materials, the instrument pneumatic valve is mainly used in the 'on' or 'off', but with a special form of plunger or special thimble, can also be used to adjust flow.
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pneumatic valve selection guidelines as pneumatic valve pneumatic valve stem axis and the vertical pneumatic valve seat sealing surface. Pneumatic open or close the valve stem travel relatively short, and very reliable cutting action, make this instrument pneumatic valve is very suitable for used as medium cut or adjust and throttling. By the pneumatic valve pneumatic disc once in an open state, the pneumatic seat and disc is no longer contact between the sealing surface, and very reliable cutting action, close to the instrument pneumatic valve is very suitable for used as medium cut or adjust and throttling. Once by the pneumatic valve is fully open, it is no longer between pneumatic seat and clapper sealing surfaces have a contact, it is thus the sealing surface of mechanical wear and tear is small, as most as pneumatic valve pneumatic seat and disc is easier to repair or replace the whole instrument pneumatic valve sealing components without removed from the pipeline, this instrument pneumatic valve and pipeline welding into one occasion is very applicable. Medium through such instrument pneumatic valve flow direction changed, so stop pneumatic valve flow resistance is higher than other instrument pneumatic valve.