Polypropylene Butterfly Valve to include sizes 14 to 24 inch. This completes the large diameter size offering of 12 to 24 inch and broadens suitability for a wider range of applications. Like the proven smaller sizes in the series, the new larger sized butterfly valves feature the double eccentric design, corrosion resistance and complete modularity for easy interchangeability. The Type 567′s double eccentric off-center design allows the disc to completely disengage from the disc seal, even when partially open. This separation between disc and seal reduces friction and wear for longer service life and minimizes maintenance compared to non-eccentric valves. Additionally, the double eccentric design requires only about half the torque of a traditional boot design, which also reduces wear on the disc seal to further enhance product life. Other advantages of the design include easier manual operation, compatibility with smaller actuators for reduced installation cost and better protection against pressure surges.

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