19

2019

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09

What are the internal and external leakages of electric ball valves? what is the difference? Answered

Author:


In daily use of electric ball valves, various faults are often encountered. Leakage of electric ball valves is one of many common faults, and leakage of electric ball valves is generally caused by internal leakage and external leakage ! What's the difference?   Electric ball valve leakage generally means that when the electric valve is completely closed, there is still medium flowing out from the flow diameter outlet of the electric valve, leaking or dripping. In layman's terms, it means that it is not closed strictly and the sealing is not good! The cause of failure is usually caused by corrosive wear or inclusion of impurities in the medium. Even if the electric valve screw (valve stem) is screwed in place, there is still a gap between the valve core and the valve body, and the medium can still pass through.

  In daily use of electric ball valves, various faults are often encountered. Leakage of electric ball valves is one of many common faults, and leakage of electric ball valves is generally caused by internal leakage and external leakage ! What's the difference?

  Electric ball valve leakage generally means that when the electric valve is completely closed, there is still medium flowing out from the flow diameter outlet of the electric valve, leaking or dripping. In layman's terms, it means that it is not closed strictly and the sealing is not good! The cause of failure is usually caused by corrosive wear or inclusion of impurities in the medium. Even if the electric valve screw (valve stem) is screwed in place, there is still a gap between the valve core and the valve body, and the medium can still pass through.

  Electric ball valve leakage generally refers to the leakage of media from the external sealing part of the electric valve packing when the electric valve is completely closed or opened. The connection between the electric ball valve and the connecting flange or thread leads to an unsealed sealing surface to seal the medium flow connection, or a loose seal between the block grant (i.e. the pressure valve stem packing gland) causing medium leakage, or the body's Blanks and trachoma are caused by external leakage, and leakage caused by erosion and wear of media outside the body.

  The main factors affecting the dead zone of electric ball valves are: friction, drift, valve shaft torsion, and amplifier dead zone. Different control valves are sensitive to friction, such as rotary valves, which are sensitive to friction caused by high seat loads. However, with some seal types, high seat loads are necessary to obtain shutdown ratings. Therefore, the design of the electric ball valve is very poor, and it is easy to produce a large dead zone. The impact of the dead zone on the degree of process deviation is obvious and almost decisive.