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4 inch ball valve

ZECO 4 inch ball valve is designed with automatic pressure relief structure.When the change of pressure or temperature in the pipeline causes the abnormal rise of pressure in the valve body, the medium will open the sealing ring by the pressure of overpressure for automatic pressure relief, so as to ensure the safety of the valve and the pipeline; 2. ZECO 4 inch ball valve has a reliable seating

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