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2019-05-31 Detection of air tightness of spherical ball valves
2019-05-31 Function of Ball Valve
2019-05-31 Points for Attention in Installation of Ball Valve
2019-05-31 Introduction of Ventilation Butterfly Valve
2019-05-31 Structure and performance of butterfly valve
2019-05-31 Advantages of Manual Ventilation Butterfly Valve
2019-05-31 Characteristics and Application of Stainless Steel Butterfly Valve
2019-05-31 The structure of butterfly valve

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