气动执行元件主要分为直线往复式、摆动式以及连续回转式。气缸又分为单作用式、双作用式、无杆式、膜片式、气囊式、冲击式、锁紧式、导向式、短行程式、摆动式、手指式、组合式等，根据其结构、功能和形状不同，种类繁多。单作用气缸分为弹簧复位和外力复位。
单作用活塞 single-step-type cylinder 单作用气缸 single acting cylinder 单作用往复高压泵 single-acting reciprocating high pressure pump ..
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他们常用的交替施加压力和排气阀门执行器或单作用气缸的压力。
They're commonly used to alternately apply pressure to and exhaust pressure from a valve actuator or a single acting cylinder.
他们常用的交替施加压力，排气从，阀门执行器或单作用气缸的压力。
They're commonly used to alternately apply pressure to, and exhaust pressure from, a valve actuator or a single acting cylinder.
分析了非对称气动伺服阀控单作用气缸的气动压力控制系统的数学模型。
The mathematical model of a pneumatic force control system with an asymmetric servovalve and a single-acting cylinder were described.
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