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.
导阀主要由阀座、阀瓣、膜片、弹簧、调节弹簧等零件组成。
Mainly by the pilot valve seat, valve, diaphragm, spring, adjusting springs and other parts.
膜片弹簧式气制动阀作为控制阀已广泛地应用于拖拉机挂车制动系统。
Diagraph spring pneumatic brake valve is widely used as control valve for tractor - trailer braking system.
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