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has the pressure loss is almost zero, the electric ball valve on-off valve need to rotate for 90 & deg; , sphere in boundary position automatic positioning, low power consumption, wide range of output torque and easy to control etc. , is one of the first valve of electromechanical integration design. Gas valves in such aspects as safety, air tightness and stability reliability has strict requirements, and the dynamic seal is one of the main factors affecting the performance. Electric ball valve main dynamic seal at the axis of rotation, to date, most dynamic seal design adopts the contact seal, there is a sealing material is easy to wear and poor reliability, mechanical transmission efficiency is low, narrow speed range and poor sealing of faults.
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