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Body Size: 4 inches (100 mm) Body Material: Ductile iron, stainless steel, aluminum, Disc: Usually stainless steel Seat: Rubber, EPDM, PTFE, Stem: Stainless steel Operating Temperature Range: Depends on materials, but usually -20°F to 250°F (-29°C to 121°C) Pressure Range: Can handle pressures up to 150-300 psi depending on materials and design Actuation: Manual lever, gear operator, pneumatic actuator, electric actuator End Connection: Flanged, wafer, lug style Flow Characteristics: Butterfly valves provide relatively high capacity and have quick open/close ability, but do not provide tight shutoff compared to ball or gate valves Typical Applications: Isolation, throttling, control in water, air, gas, steam and other non-viscous fluid applications
