Adjust the choice of pneumatic valve actuator

is the most simple pneumatic diaphragm, followed by the piston, the last is dynamic.
electric actuators are main advantage is the driving source is convenient, but the price is high, the reliability, water-proof explosion-proof than pneumatic actuators, so should first choose pneumatic.
the old electric actuators are bulky, and we have electronic precision small electric actuators provide high reliability.
the old film actuators can be eliminated, light actuator replaced by a more spring ( Performance improvements, weight, height of drop about %) 。
the piston actuator varieties and specifications, with the old, big and silly advice is no longer choose, and choose the light of the new structure.