Series 21A-F

The CMO 21A-F Wafer Butterfly Valve is a specialist concentric butterfly valve designed for fire protection and water supply systems requiring reliable shut-off performance and certified safety compliance. Engineered for low pressure loss and dependable bidirectional sealing, the 21A-F Series is ideal for fire protection installations, sprinkler systems, pumping stations and industrial water distribution networks. Manufactured with a durable ductile iron GJS400 body and available with ductile iron or stainless steel disc options, the valve offers excellent mechanical strength and corrosion resistance for long-term operation in demanding environments. Its compact wafer-type design allows straightforward installation between flanges without the need for additional gaskets, simplifying maintenance and reducing installation time. The 21A-F Series provides 100% watertight sealing and bidirectional flow capability, ensuring dependable isolation performance in critical fire protection applications. The streamlined disc profile minimises head loss and improves hydraulic efficiency throughout the system. Stainless steel bolts and corrosion-resistant components further enhance durability and operational reliability. Designed for PN16 systems and compatible with ANSI 150 flange standards, the valve is available in sizes from DN40 up to DN600. The series includes integrated limit switches and is available with lever, gearbox, pneumatic or electric actuation options depending on system requirements. UL/FM certified versions are also available for approved fire protection installations. Operating temperatures vary depending on seat material selection, with standard EPDM seated versions typically suitable for temperatures between -10°C and +90°C, while specialist seat materials can support higher operating temperatures for industrial applications. Manufactured and hydrostatically tested to stringent quality standards, the valve complies with EN 12266-1 testing procedures and EN 558 Series 20 face-to-face dimensions for compatibility with standard pipe systems. Held in stock at Ultravalve and competitively priced, the CMO 21A-F Wafer Butterfly Valve provides a reliable and cost-effective solution for fire protection and industrial water systems.