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An important product from Flowserve: the Company that introduced the CPI's first fluoropolymer lined butterfly valve in 1965! Extra wide spheroidal seat design provides positive shutoff. One-piece 1/8 in (3 mm) thick (nominal) PFA or UHMWPE encapsulated disc locked onto nickel-plated ductile iron substrate or choose from a wide variety of alloys.

Maintenance Free, Live Loaded Triple Seal Design Assures Bubble Tight Shutoff Stem Seals Dynamically energized shaft seals provide super safe operation. The primary seal is formed at the disc hub by the spherical ball and socket disc/liner seal. An independent secondary seal of PTFE covered PFA convolutions on the disc stem enhances sealing with its torturous no-leak path design. Finally, the O-rings in the alloy gland follower offer added protection from external media corrosion as well as preventing leakage to the atmosphere. Leak tight sealing is further assured by a compression spring which keeps the dynamic pre-load force constant while energizing the various components of the triple shaft seal design. This dynamic live loaded shaft seal never needs adjustment.

Unique, energized seat design results in bubble tight shutoff. The spherical ball and socket disc/ liner design provides a 360 degree contact seat seal. The rounded radius of the disc fits into the socket of the machined liner and stays in constant contact with the seat. The liner itself is recessed into the valve body for added stability and to prevent possible leakage due to cold flow or improper valve installation. A live loaded elastomer seat energizer enhances sealing. Isolated and protected in the grooved valve body, the elastomer energizer operates independently of mating flange torque for constant line seal performance.

Features

• 1/8 in (3 mm) thick (nominal) rigid machined PTFE or UHMWPE liner is recessed in body preventing cold flow and facilitating installation.
• Disc swing is compatible with ASTM F423-82 fluoropolymer lined pipe.
• ASTM A395 ductile cast iron split body provides Popular Double-D shaft drive provides positive valve position indication and simplifies adaption to automatic operation.
• Interchangeable actuator mounting plate accommodates ISO, MSS or special actuators. 10-position locking lever and throttle plate or gear operated options are available.
• Epoxy coated body and mounting plate resist the effect of atmospheric corrosion
• Wafer or lug body is rated to 150 psi.

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