Resilient Seated Butterfly Valve – Series 20/21, Wafer/Lug Type, Concentric Design

The Resilient Seated Butterfly Valve Series 20/21 is designed for reliable flow control in a wide range of general-purpose industrial applications. This valve features a concentric design with a centered disc and shaft configuration that provides smooth operation, minimal torque, and excellent sealing performance.

Constructed with a durable ductile iron body and a fully vulcanized resilient liner, the Series 20 (wafer type) and Series 21 (lug type) valves ensure long service life, corrosion resistance, and zero leakage in both directions. The lightweight and compact form make them easy to install between flanges, requiring no additional gaskets due to the integrated liner design.

Ideal for water distribution systems, fire protection networks, HVAC circuits, and process industries, the Series 20/21 valves are compatible with ISO 5211 actuator mounting, supporting electric, pneumatic, or manual actuation options.

Specifications:

– Valve Type: Resilient seated butterfly valve
– Series: 20 (Wafer), 21 (Lug)
– Design: Concentric, double offset-free
– Size Range: 2” to 24”
– Pressure Rating: PN10 / PN16
– Temperature Range: -10°C to +110°C (depending on liner material)
– Body Material: Ductile Iron ASTM A536
– Disc Material: Stainless Steel, Ductile Iron, Aluminum Bronze
– Shaft Material: Stainless Steel AISI 416 / AISI 431
– Liner/Seat Material: EPDM, NBR, FKM (Viton), PTFE (optional)
– End Connection: Wafer / Lug between flanges
– Face-to-Face: ISO 5752, EN 558 Series 20
– Flange Compatibility: EN 1092-2, ANSI B16.5 Class 150, BS 4504
– Actuation: Lever, Gearbox, Pneumatic or Electric
– Mounting: ISO 5211 top flange
– Testing Standards: API 598, EN 12266-1
– Applications: HVAC systems, potable water, wastewater, fire protection, chemical and general industrial use

For further specifications or to inquire about this equipment and ReflowX's logistics services, Please contact ReflowX at info@reflowx.com