Adjust the choice of pneumatic valve actuator

（ ） Pneumatic film is the most simple, followed by the piston, and finally, electricity. （ ） The main advantage of electric actuators is driving source ( The power supply) Convenient, but the price is high, the quality is reliable, water proof of pneumatic actuators, pneumatic it should be the first choice. （ ） Old heavy electric actuators, we have a high reliability electronic fine small electric actuators provide xing ( The price is relatively high. ） （ ） Old ZMA ZMB diaphragm actuator can be representative of the counter of the spring actuator light many ( Xing can be improved, weight and height down about %) 。 （ ） Piston actuator specifications is old, big, stupid advice no longer use and selection of new structure light.