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.
本文详细研究了平衡阀控制活塞的结构形式和主要结构参数对系统动态性能的影响。
This paper makes a detailed study of the counterbalance valve and its sy tem, and discusses the effects of the control pistons forms and the main parameters on dynamic characteristic of the system.
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