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.
介绍了作者自行设计的带冷凝器新型弹簧活塞式压力自平衡装置结构及其工作原理。
The structure and working mechanism on the new type of spring-piston pressure auto-balancing device with condenser was introduced.
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