The control principle of a pneumatic knife gate valve is to open and close the valve using pneumatic devices. Here’s a simple breakdown:

1.Air Supply: Air flows through pipes into the cylinder inside the pneumatic device.

2.Cylinder Activation: When the cylinder in the pneumatic device receives air, it creates a force that pushes the valve stem upwards.

3.Valve Stem Movement: The valve stem is connected to the valve plate. The up-and-down movement of the valve stem moves the valve plate, controlling the opening and closing of the valve.

4.Control Signal: The pneumatic device receives a control signal, converts it into a force, and uses that force to move the valve stem.

5.Valve Opening: When the pneumatic device gets an opening signal, the cylinder generates a force to push the valve stem upwards, lifting the valve plate away from the valve seat, opening the valve.

6.Valve Closing: When the pneumatic device gets a closing signal, the cylinder generates a force to push the valve stem downwards, making the valve plate touch the valve seat, closing the valve.

Through this principle, the pneumatic knife gate valve allows remote control operations with quick opening and closing, wear resistance, and high reliability.