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In the daily use of electric valves, various failures are often encountered. Leakage of electric valves is a common one among many failures, and there are generally two types of leakage of electric valves: internal leakage and external leakage! So, what is the difference between the two?
Internal leakage of electric valves generally refers to situations where media still flows out, leaks, or drips from the outlet of the flow path of the electric valve after the electric valve is completely closed. Generally speaking, it means that the valve is not tightly closed and sealed properly! The cause of this failure is usually due to the erosion and wear of the medium or the inclusion of impurities. Even if the electric valve lead screw (valve rod) is tightened in place, there is still a gap between the valve core and valve body, and the medium can still flow through.
The leakage of electric valves generally refers to the leakage of media from the external sealing parts of the electric valve packing when the electric valve is fully closed or opened. That is, between the electric valve and the connecting flange or thread, the seal is not tight enough to cause media to flow out of the connecting sealing surface, or the seal between the valve rod and the gland (i.e., the gland of the pressure plate root on the valve rod) is not tight enough to cause media leakage, or there are sand holes on the valve body blank, as well as external leakage caused by the wear of the valve body due to media erosion.
The main factors that affect the dead zone of electric valves include friction, travel, valve shaft torsion, and amplifier dead zone. Various control valves are different in their sensitivity to friction, such as rotary valves, which are very sensitive to friction caused by high seat loads, so this should be noted when using them. However, for some seal types, high seat loads are necessary to achieve a closure level., In this way, this type of valve is poorly designed and prone to large dead zones, which have an obvious and decisive impact on the degree of process deviation.
