Analysis of expansion pipe and pneumatic valve type

there are all kinds of expansion pipe and the pneumatic valve, usually people don't have a detailed analysis of classification and is likely to cause confusion in its use, make the difference between technical personnel, to understand the following your future, and USES the difference between the two. Pneumatic valve accessories include:
duck mouth actuator - Pneumatic actuators - Electric actuators - Hydraulic actuators - Hydraulic executing agency - Electro-hydraulic actuators - Handle the
for fitting you have the expansion joints, what is? Collection description: handwheel, packing, packing gland, pneumatic stem nut, etc. And, of course, the above said conventional pneumatic valve, pneumatic valves should also be different models and types and accessories is slightly different.
duckbill pneumatic valve positioner and accessories: pneumatic pneumatic valve positioner - Electric pneumatic valve positioner - Smart pneumatic valve positioner - Servo control - Servo amplifier - Electrical converter - Filter pneumatic - valve to relieve stress The pneumatic - valve position transmitter A pneumatic valve - Solenoid pneumatic valve - Limit switches - Air amplifier - Intelligent modules - Servo control - Servo amplifier - The police - Explosion-proof coil - Quick exhaust pneumatic valve