In terms of action mode, the gate valve is a straight travel valve, that is, the valve stem drives the valve plate to make vertical movement up and down to complete the opening and closing of the gate valve, so the flow resistance of the gate valve is small. However, because of its high opening height, the opening and closing speed is slow. The pneumatic butterfly valve is an angle travel valve, that is, the valve plate of the butterfly valve rotates 90 ° around the valve axis to complete the opening and closing of the butterfly valve. Therefore, the opening height of the butterfly valve is only one fourth of the channel diameter, so it can be opened and closed quickly. According to the function and purpose of the gate valve and butterfly valve, the gate valve has small flow resistance and good sealing performance. Because the gate valve plate and the medium flow direction are vertical angles, if the gate valve is not in place on the valve plate, the flushing of the medium on the valve plate will make the valve plate vibrate, which is very easy to damage the seal of the gate valve.

3. The linear structure in the central line type structure is composed of the valve body, inner lining (PTFE or rubber), (stainless steel valve plate or chrome plated steel valve plate) and valve shaft. The medium streamline structure design is similar to the straight line, with good adjustment performance. The sealing structure is centered linear sealing, and the sealing performance is reliable to achieve two-way sealing and zero leakage. It can be installed anywhere.