operation valve meaning in Chinese

控制阀

The first section is about the way and principle of the h ( k ) f operation valve ; the second section is about controlled way of the air gate . the third section is about the controlled and transmission of the pressure signals in train pip , auxiliary pressure air tank and bake tank ; the fourth section is about the auto test way and principle of the three thoroughfare valve leakage
第一部分是h ( k ) 、 f操作阀的控制方法和原理；第二部分是风门的控制方法与原理；第三部分是列车管、副风缸、制动风缸压力信号的采集与传输控制；第四部分是三通阀漏泄自动检测方法与原理。