1, accept continuous gas signal, the output linear displacement (plus electric/gas conversion device, can also accept continuous electrical signal), some with rocker arm, can output angular displacement.

2, have positive and reaction function.

3, movement speed, but load increases speed will slow.

4, output force and the operating pressure.

5, high reliability, but air after interrupting the valve can not keep (plus the position valve after can keep).

6, maintenance is simple, good adaptability to the environment.

7, large output power.

8, has the explosion protection function.