Working principle of single-acting normally closed type:

According to the function of spring reset to close the valve, only one air pipe needs to be installed when working, the valve opens when the air is ventilated, and the air cut valve closes automatically. It is easy to install and use under normal pressure and temperature.

Working principle of single-acting normally open type:

The valve is closed according to the ventilation, and only one air pipe is required when working. The valve is closed when the air is ventilated, and the air-cut valve is automatically opened. It can be used when the valve needs to be opened for a long time under normal pressure and normal temperature.

Working principle of double-acting with spring closing type:

According to the ventilation control valve switch, it is necessary to install two air pipes when working. In case of emergency (power failure), the valve can be automatically closed. The user can also install the valve direction freely according to the use situation. , Waterproof hammer, etc.) The control is more precise and stable.

Working principle of double acting (free state):

According to the ventilation control valve switch, it is necessary to install two air pipes when working. When the pressure of the control actuator is low, the user can open the valve according to the use condition and it will be in the normally open state. The use of double-acting free state at low pressure and low temperature can prolong the life of the valve.