该系列是一种采用多弹簧结构，重量轻、体积小、性能高、输出力大的气动薄膜式角行程执行机构。

该系列执行机构与定位器配合使用可实现高精度 的位置控制。 

This serieses is high performance, high power diaphragm actuators of multi-spring type that are compact and light, Receiving pneumatic or electric signals, the unit balances the force created when diaphragm is air-pressured through positioner and the force of compressed spring, so that the output shaft is controlled and placed at a set position. Combination with KOSO positioner provides high accuracy position control.