Pneumatic valve selection principle

pneumatic valve selection should consider the main parameters of the
( The conveying fluid properties, which will affect the pneumatic valve type pneumatic valve structure and material selection.
　　( Functional requirements ( To adjust or cut off, the main effect of pneumatic valve type selection.
　　( Operating conditions ( Is frequent, this will affect type pneumatic valve and pneumatic valve material selection.
　　( The flow characteristics and friction loss.
　　( The size of the pneumatic valve nominal size ( Nominal size large pneumatic valve only in a limited range of pneumatic valve type can find it.
　　( Other special requirements, such as automatic shutdown, equilibrium pressure, etc.