UL FM Approved Wafer Butterfly Valve

A UL FM approved wafer butterfly valve is a fire protection-rated valve that has been tested and certified by Underwriters Laboratories (UL) and Factory Mutual (FM) for use in fire sprinkler and suppression systems. The wafer-style design fits between ASME B16.5 flanges, providing a lightweight and compact solution for fire protection pipelines. Supreme Valves exports these valves to Saudi Arabia, UAE, Qatar, and other Middle Eastern markets with full certification documentation for SABER compliance.

UL FM approved wafer butterfly valves are available in Class 150 (PN20) and Class 300 (PN50) pressure ratings, covering working pressures up to 300 PSI (20 bar) and 740 PSI (50 bar) respectively. The valve selection depends on the system design pressure, with NFPA 13 requiring valves in fire protection systems to be rated at or above the system test pressure. Our cast iron and ductile iron body valves are factory-tested to 1.5x the rated pressure.

Fire protection wafer butterfly valves typically use Cast Iron (ASTM A126 Class B) or Ductile Iron (ASTM A395) for the body, with Stainless Steel 304 or 316 for the disc. The seat is EPDM rubber for cold water and NBR (Buna-N) for petroleum-based fire alarm systems. Stems are typically SS416 or SS316. Supreme Valves uses only certified materials traceable to ASTM standards, with material test certificates (MTC) provided with each export shipment.

Wafer-style butterfly valves are lighter and more compact than lug-style valves, requiring less bolt length since they center between the flanges. However, lug-style valves allow for downstream flange removal without valve isolation (dead-end service). For fire protection systems where the valve is always installed between two live flanges, wafer design is the preferred choice. Both designs are UL Listed and FM Approved when used within their rated pressure-temperature limits per NFPA 13.

FM approved wafer butterfly valves can be equipped with manual handwheels, gear operators with chain wheels, pneumatic actuators (spring-return or double-acting), or electric actuators. ISO 5211 mounting flanges ensure compatibility with standard actuator interfaces. For fire suppression systems, spring-return pneumatic actuators provide fail-safe closing upon air supply loss, while gear operators with chain wheels are specified for underground pit installations.

Yes, UL FM approved wafer butterfly valves are suitable for underground fire main applications when installed in accessible valve pits or chambers. The valve should be specified with a gear operator and chain wheel for underground pit operation. Post-indicator valves (PIV) or underground gate valves should be installed upstream per NFPA 24 requirements. Supreme Valves supplies wafer butterfly valves with extended stems for pit applications and can provide chain wheel operators rated for underground service.