Gravity Counterweight Butterfly Valve
Industrial fluid handling demands components that balance reliability with operational simplicity. Our engineering focus centers on the Weighted Counterbalance Butterfly Valve, a design that harnesses gravitational force to maintain disc position without external actuators. This concept extends to the Counterbalanced Butterfly Valve, where adjustable weights optimize torque profiles for high-cycle applications. The Dead Weight Butterfly Valve variant strips complexity further, using fixed mass to ensure failsafe closure in critical isolation duties. Each configuration prioritizes minimal pressure drop, bubble-tight sealing, and extended service life across water treatment, power generation, and process industries.
The Gravity Counterweight Butterfly Valve integrates a precision-machined disc and a resilient elastomer seat to achieve bidirectional zero-leakage performance. The counterweight assembly, forged from ductile iron, provides smooth operation and eliminates valve slam through controlled inertia. Material options range from carbon steel to duplex stainless steel, with coatings suited for corrosive media. The Gravity Counterweight Butterfly Valve is field-proven in cooling loops, fire protection mains, and slurry handling, where its self-contained counterbalance reduces dependence on pneumatic or electric actuation.
- Wafer, lug, and double-flanged body styles
- NBR, EPDM, Viton, or PTFE seat materials
- Leakage rate per API 598 zero-leakage standards
- Counterweight shielded from direct fluid contact
- Manual gearbox or automatic actuator options
- Face-to-face dimensions compliant with ISO 5752
- Fire-safe design per API 607 available
| Parameter | Details |
|---|---|
| Size Range | DN 50 – DN 1200 (2”– 48”) |
| Pressure Class | PN 6 – PN 25 (Class 150 – 300) |
| Temperature Range | -29°C to 200°C (-20°F to 392°F) |
| Body Materials | Cast iron, ductile iron, carbon steel, stainless steel |
| Disc Materials | Ductile iron, stainless steel 304/316, duplex 2205 |
| Seat Types | Resilient (EPDM, NBR) or metal-seated |
| Actuation | Lever with counterweight, gear-operated, electric, pneumatic |
| Test Standard | API 598 / EN 12266-1 |
| Counterweight Locking | Manual locking pin for maintenance safety |
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