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Bi-directional Seal Metal Seated Triple Offset Butterfly ValveIntroduction With years of research and development, our triple eccentric butterfly valve has he benefits of less weight, less cost, zero friction and zero leakage. The triple eccentric design makes no friction between the disc and body seat. The low torque shall certainly reduce the ownership cost. Design BenefitsMetal seated, triple offset design provides bi-directional zero leakage shutoffSelf-centering disc prevent..