Lined Butterfly Valve Ptfe Pfa Fep

A lined butterfly valve is a quarter-turn isolation valve designed to separate corrosive process media from the metallic valve body. A fluoropolymer liner forms the wetted barrier while the disc rotates 90 degrees for shutoff or flow passage. In an electric configuration, an actuator provides automated operation within a compact wafer arrangement. The design supports bidirectional flow, high flow capacity, and wafer or lug connections.

Why fluoropolymer lining changes valve selection

The liner directly contacts the process medium, so material selection should match chemical concentration, operating temperature, pressure, and permeation conditions. A ptfe lined butterfly valve is commonly selected for aggressive chemical service, while PFA can provide a wider temperature range in suitable applications. FEP offers another fluoropolymer option when the operating conditions remain within its rated limits. Liner performance also depends on the interaction between the seat, disc edge, shaft sealing, and body structure.

Electric actuation and wafer geometry

The wafer body fits between pipe flanges and requires less installation space than many larger valve arrangements. An electric actuator provides repeatable on/off operation or position control, while torque, cycle frequency, feedback, and manual override should be matched to the process requirement. The listed configuration supports PN10, PN16, and 150 LBS pressure classes. Its temperature ranges are -29°C to 180°C for PTFE, -29°C to 200°C for PFA, and -29°C to 150°C for FEP.

FAQ

What is a lined butterfly valve used for?
It is mainly used to isolate corrosive liquids or gases where the process medium must remain separated from the metallic body.

Are pfa lined butterfly valves suitable for every chemical?
No. Selection depends on chemical compatibility, concentration, temperature, pressure, and the complete valve construction.

Where are fep lined valves considered?
They are considered for corrosive service where operating temperature, pressure, and chemical exposure remain within the specified design limits.

What determines lined valve suitability

Valve selection depends on the complete service profile rather than the valve name alone. Chemical compatibility, liner material, pressure class, temperature range, flange arrangement, actuator torque, and shutoff requirements should all be reviewed before specification. This approach reduces the risk of premature liner wear, sealing problems, or actuator mismatch and creates a clearer basis for selecting a valve for corrosive process lines.