Electric butterfly valves are the most widely used in metallurgy, steel making, petroleum, and production lines. Play a separate role in the piping system. The structural feature is the use of upper and lower lifting rams to allow pressure on both sides of the valve.
Truncate or limit the flow of the pipe. Rarely have single gate, double gate, parallel, wedge and other structures. The butterfly valve is characterized by quick opening and closing speed, simple structure and low cost, but the tightness and pressure bearing capacity are not good. The characteristics of the ball valve are similar to those of the gate valve, but it is difficult to achieve the large diameter due to the limitation of the volume and the opening and closing resistance. The electric butterfly valve should be a clip-on turbine driven hard seal butterfly valve, not flanged, and does not have the ability to eliminate water hammer. The function is to solve the problem of the pressing of the disc and the valve seat of the concentric electric butterfly valve, and thus the single eccentric electric butterfly valve is formed, and the structural feature is that the stem axis is deviated from the center of the disc, so that the lower end of the disc is no longer turned. The shaft center, the dispersion, and the excessive extrusion of the lower end of the disc and the valve seat are alleviated.
In order to eliminate the water hammer, it is necessary to install a water hammer absorber or a slow-closing check valve. Only the disc-shaped check valve with a slow-closing function prevents the water hammer. The sealing of ball valves is usually flexible and difficult to use in high temperature and high pressure pipes. In comparison, the electric butterfly valve seal is better than the ball valve. The check valve is characterized by restricting the flow direction of the medium and allowing the medium to flow in one direction. Commonly used are swing type and lift type.