Piping Systems has announced expansion of its large diameter size range for
the Wafer Style Type 567 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 valves feature the double eccentric
design, corrosion resistance and complete modularity for easy
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
valves weigh approximately 50 percent less than comparable metal butterfly
valves thereby providing easier and faster installation and lower costs. The
new large dimensions provide high nominal pressures for increased operation
safety. Pressure ratings at 70F are 90 psi for sizes14 to 16 inch, 75 psi for
size 18 inch, and 60 psi for sizes 20 to 24 inch. Other features include industry-standard
ISO flange mount for easy electric or pneumatic actuation, bi-directional
capability and hand wheel. The valve is available with either EPDM or FPM
seals, 304 or 316 stainless-steel stem and a Polypropylene body.
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