弹簧平衡型、气动膜片或活塞，执行机构对于开关阀是首选的。
Spring opposed , air operated diaphragm or piston, actuators are preferred for on-off applications.
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.
本实用新型介绍一种引导阀活塞复中机构，属于具有随动作用的伺服马达技术领域。
The utility model introduces a mechanism for guiding a valve piston returning to central positions, belonging to the technical field of a servomotor with follow-up action.
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