气动活塞式执行机构可分为单作用和双作用两种。
Pneumatic piston actuators can be divided into single and double acting two.
它由气动活塞式执行机构和O型球阀组成，阀芯采用圆柱形通孔球体。
It consists of pneumatic piston actuator and the composition of O-type ball valve, valve core sphere using cylindrical hole.
因此，它具有电动执行机构的快速响应性和活塞式执行机构的推力大等优点。
Therefore, it has a fast response electric actuator and the executing agency of the thrust piston big and so on.
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