Counterbalanced Butterfly Valve
In heavy-duty fluid handling systems, reliable passive control is a cornerstone of operational safety. Our comprehensive suite of counterbalanced valves addresses this need through robust mechanical design. The Weighted Counterbalance Butterfly Valve utilizes an adjustable weight lever to deliver precise torque for disc modulation, while the Gravity Counterweight Butterfly Valve relies on a hinged counterweight for instant closure upon loss of pressure differential. For applications demanding a fixed, unpowered shutoff, the Dead Weight Butterfly Valve offers a solid weight assembly that ensures consistent performance. Common installations include pump discharge lines, water distribution networks, and turbine bypass systems where backflow prevention is critical.
The Counterbalanced Butterfly Valve excels in high-flow scenarios by maintaining low head loss and eliminating water hammer risks through its smooth disc profile. Field adjustment of the counterweight mechanism allows fine-tuning to specific pipeline pressures, ensuring the disc automatically returns to a safe closed position without external actuators. This passive fail-safe architecture reduces total lifecycle costs and simplifies maintenance intervals.
Core Configuration Options
- Size Spectrum: DN50 to DN1200 (2″ – 48″)
- Pressure Ratings: ASME Class 125, 150, 250, 300; PN10, PN16, PN25
- Body Materials: Ductile iron, carbon steel, cast stainless steel, or nickel-aluminum bronze
- Disc Design: Streamlined disc in ductile iron with nickel plating, duplex stainless steel, or Monel
- Seat Systems: Soft-seated (EPDM, NBR, Viton) for bubble-tight sealing; metal-seated for high-temperature service
- Connection Types: Wafer, lug, or double-flanged per ISO 7005-2, EN 1092, ASME B16.5
- Counterweight Materials: Cast iron, galvanized steel, or concrete-filled steel shells
- Shaft Seal: Self-adjusting V-ring packing or live-loaded PTFE
Technical Performance Table
| Parameter | Specification |
|---|---|
| Leakage Class | ANSI/FCI 70-2 Class VI (bubble-tight) for resilient seats |
| Operating Temperature | -20°F to 450°F (-29°C to 232°C) |
| Flow Characteristic | Equal percentage or modified linear |
| CV Values | Tailored per size, full range available on request |
| Torque Safety Factor | Minimum 1.3× against calculated dynamic torque |
| Testing & Inspection | API 598, MSS SP-61, shell and seat tests per ISO 5208 |
| Fire Safety Option | API 607 / ISO 10497 certified upon request |
| Actuation Add-ons | Manual gear operator, limit switches, or positioners |
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