Features and operation of electric shut-off valve

The characteristics and operation of electric globe valve must read
The electric globe valve and the flange gate valve belong to the same type of valve. It consists of an electric actuator or a pneumatic actuator and a globe valve. The difference is that the closing part is a valve body. A closed valve. The gate valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. It is a new type of valve widely used in recent years.
特征 Characteristics of electric globe valve:
１． The fluid resistance is small, and its resistance coefficient is equal to the pipe length of the same length.
２． Simple structure, small size and light weight.
３． It is tight and reliable. The sealing surface material is widely used in plastics and has good tightness. It has also been widely used in vacuum systems.
４． Convenient operation, fast opening and closing, only need to rotate 90 ° from fully open to fully closed, which is convenient for remote control.
５． Convenient maintenance. Sealing rings are usually movable, and it is easier to disassemble and replace.
Q6. When fully open or fully closed, the sealing surfaces of the ball and valve seat are isolated from the medium, and the medium will not cause erosion of the valve sealing surface when the medium passes.
7. Wide range of applications, from small diameter to several millimeters to several meters, from high vacuum to high pressure can be applied.
When opening and closing the electric globe valve, the force should be stable and not impact. Some parts of the high-pressure shut-off valve that have been opened and closed by shock have considered that this kind of impact force is not equivalent to the ordinary shut-off valve.
后 When the electric shut-off valve is fully opened, the handwheel should be turned a little back to tighten the threads tightly to prevent loosening damage.
When the pipeline is used for the first time, there is a lot of internal dirt. The floating ball valve can slightly open the electric shut-off valve, use the high-speed flow of the medium, flush it away, and then gently close it. Sealing surface), open again, repeat this many times, rinse the dirt, and then put into normal work.
冷却 After the electric shut-off valve is closed and cooled to shrink the valve, the operator should close it again at an appropriate time so that the sealing surface does not leave any crevices. Otherwise, the medium flows through the crevices at high speed and it is easy to erode the sealing surface.
When operating the electric shut-off valve, if it is found that the operation is too laborious, the cause should be analyzed. If the packing is too tight, it can be properly relaxed. If the valve stem is skewed, the personnel should be notified to repair it. Some electric shut-off valves, stainless steel gate valves are closed when heated, which causes opening difficulties. If you must open at this time, you can loosen the thread of the valve cover half a turn to one circle to eliminate the stress on the valve stem, and then operate the board. wheel.