Flanged Butterfly Valve

UL Listed Flanged Butterfly Valve

UL Listed

Concentric flanged butterfly valve for general industrial and fire protection applications. Compact design with low torque operation.

Key Features

  • UL Listed for fire protection
  • Concentric design
  • Flanged end connections
  • Ductile iron body with FBE coating
  • EPDM seat - bubble-tight shutoff
  • Bi-directional installation
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Technical Specifications

Design StandardAPI 609, EN 593
Face to FaceISO 5752, EN 558
End ConnectionFlanged PN16
Size RangeDN40 - DN1200
Body MaterialDuctile Iron GGG-50
Disc MaterialDuctile Iron / SS304
Seat MaterialEPDM / NBR / Viton

Purchase Options

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Materials of Construction (MOC)

Component Material Specification
Body & Bonnet Ductile Iron (ASTM A536 / EN-GJS-400-15)
Stem / Spindle SS 410 / SS 420
Seat / Trim EPDM / NBR / Bronze

Technical Specifications

Parameter Specification / Standard
Manufacturing / Design Standard EN 1171 / AWWA C509 / BS 5163
Testing Standard API 598 / EN 12266-1
Pressure Rating PN16 / PN25

Frequently Asked Questions

What is the difference between UL Listed and UL FM Approved butterfly valves?

UL Listed means the valve has been tested by Underwriters Laboratories and meets their safety standards, but the certification process is less comprehensive than FM Approval. UL FM Approved valves have been additionally tested by Factory Mutual Global for performance in fire protection systems, which is a more rigorous standard specifically for fire sprinkler and suppression applications. For most commercial building specifications in the Middle East, UL FM Approved is the preferred certification, though UL Listed alone may be acceptable for certain industrial fire protection applications.

What is the difference between centric and eccentric butterfly valves?

A centric (concentric) butterfly valve has the disc centered on the pipe axis with the stem passing through the disc center. This is the simplest and most economical design, suitable for general water service up to PN16. A double offset (dual eccentric) butterfly valve offsets the disc both from the seat center and the stem axis, reducing seat friction and allowing maintenance without removing the valve body from the line. Triple offset valves add a third offset to the seat cone, providing metal-to-metal sealing for high-pressure and demanding service.

Frequently Asked Questions

What is the difference between UL Listed and UL FM Approved butterfly valves?

UL Listed means the valve has been tested by Underwriters Laboratories and meets their safety standards, but the certification process is less comprehensive than FM Approval. UL FM Approved valves have been additionally tested by Factory Mutual Global for performance in fire protection systems, which is a more rigorous standard specifically for fire sprinkler and suppression applications. For most commercial building specifications in the Middle East, UL FM Approved is the preferred certification, though UL Listed alone may be acceptable for certain industrial fire protection applications.

What is the difference between centric and eccentric butterfly valves?

A centric (concentric) butterfly valve has the disc centered on the pipe axis with the stem passing through the disc center. This is the simplest and most economical design, suitable for general water service up to PN16. A double offset (dual eccentric) butterfly valve offsets the disc both from the seat center and the stem axis, reducing seat friction and allowing maintenance without removing the valve body from the line. Triple offset valves add a third offset to the seat cone, providing metal-to-metal sealing for high-pressure and demanding service.