97无码免费人妻超级碰碰碰|中文字幕少妇人妻在线视频|精品欧美成人高清在线A|无码国产精品一区二区

There are various types and functions of the reversing valve. There are many types of reversing control valves, different structures and various control methods. However, the working principle is basically the same. The external force is used to make the valve core and the valve sleeve produce relative motion. The gas passage changes the direction of flow of the compressed air, thereby changing the direction in which the pressure is performed by the element.

The cut-off valve can be divided into air pressure control commutation, electromagnetic control commutation, manual control commutation, mechanical control commutation, etc. according to the control mode. The structure of the valve plug is divided into two types. The commonly used structural forms are cut-off type and sliding column type.