Worm Gear Operated Metal Seated Flanged Butterfly Valve
 | Worm Gear Operated Metal Seated Flanged Butterfly Valve
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Worm Gear Operated Metal Seated Flanged Butterfly Valve ：
This is a worm gear operated metal seated flanged butterfly valve, built with double eccentric structure for high-temperature, high-pressure and slightly corrosive industrial pipelines. The metal-to-metal hard seal provides reliable sealing even in steam, gas and flue gas services. The ductile iron or carbon steel body with blue epoxy coating offers good strength and corrosion resistance. The flanged connection ensures stable installation on standard GB/ASME pipelines, while the worm gear handwheel provides low-torque manual operation. It is widely used in thermal power plants, petrochemical plants and district heating systems. Available in PN1.0, PN1.6, PN2.5 and PN4.0 pressure grades, with DN50 to DN2000 size range. Different disc and seal materials are available to match various working temperatures and media.
Key Technical Specifications
| Item | Specification |
|---|---|
| Type | Metal Seated Flanged Butterfly Valve |
| Actuator | Worm Gear Handwheel |
| Nominal Pressure | PN1.0 / PN1.6 / PN2.5 / PN4.0 MPa |
| Working Temperature | Carbon steel: -29℃ ~ 425℃ |
| Applicable Medium | Steam, air, gas, oil, weak acid/alkali |
| Connection Type | Flanged (GB/ASME standard flanges) |
| Seat Type | Metal-to-Metal Hard Seal |
| Body Material | Ductile Iron / Carbon Steel / Stainless Steel |
| Size Range | DN50 ~ DN2000 |
Main Component Materials
| Valve Body: Ductile Iron / Carbon Steel / Stainless Steel |
| Butterfly Disc: Carbon Steel / Stainless Steel / Chrome Molybdenum Steel |
| Valve Stem: 2Cr13 / Stainless Steel / Chrome Molybdenum Steel |
| Seat: Multi-layer Metal Composite Seal |
1. High Temperature & Pressure Resistance: Metal hard seal performs reliably in high-temperature steam and high-pressure gas pipelines.
2. Double Eccentric Structure: Eliminates friction between disc and seat during opening/closing, extending service life.
3. Low Operating Torque: Worm gear design provides smooth and easy manual operation.
4. Flanged Connection: Easy installation and maintenance on standard pipeline flanges.
5. Multiple Material Options: Different body, disc and seal materials available to suit various working conditions.
Application Industries
This metal seated flanged butterfly valve is widely used in:
• Thermal power plant steam and flue gas pipelines
• Petrochemical refining and processing plants
• Metallurgical high-temperature gas pipelines
• Urban gas and district heating systems
• Industrial boiler and circulating fluid systems
