Selection guide
Choose a starting point by geometry and operating duty
This comparison is an initial navigation aid between the JNS welded butterfly valve series. Final suitability remains subject to the actual medium, pressure, temperature, shutoff duty and installation requirements.
Start from the duty your duct performs, review the matching series below, and confirm the configuration with our engineering team based on the submitted operating conditions and drawings.
Five series cover catalogue configurations as well as drawing-based custom programs. Each card links to the series overview.
VDF-25C
A fabricated butterfly valve for low-pressure ducts, flue gas treatment, dust collection and industrial gas transfer, available for project-specific configurations and OEM supply.
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VDF-25D
A double offset welded butterfly valve for frequent cycling in low-pressure systems, with reduced sliding contact at the seat and pneumatic or electric actuation options.
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VDF-25T
A triple offset welded butterfly valve for tight shutoff duties in elevated-temperature, abrasive or erosive service, with laminated or metal-to-metal sealing options subject to project review.
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VDF-25B
A project-configured airtight isolation valve for marine ventilation, compartment isolation and flue gas desulfurization duties, with pneumatic operation and corrosion protection requirements reviewed for each application.
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VDF-25CS
A drawing-based custom welded butterfly valve program for non-standard industrial projects, with dimensions, structure, connections, materials, sealing and actuator interfaces reviewed based on submitted conditions.
View seriesA first orientation between geometry, duty and configuration approach.
| Series | Geometry | Typical duty | Configuration approach |
|---|---|---|---|
| VDF-25C | Concentric | Ventilation, flue gas and dust collection | Catalogue range with project review |
| VDF-25D | Double offset | Frequent cycling and automated control | Sealing and actuation by duty |
| VDF-25T | Triple offset | Tight shutoff, elevated temperature or abrasive service | Sealing configuration by project |
| VDF-25B | Airtight isolation | Marine ventilation, compartment isolation and FGD ducts | Drawing-based project configuration |
| VDF-25CS | Custom welded valve | Non-standard dimensions and interfaces | Customer drawings and engineering review |
A series choice becomes a valve configuration once these points are fixed. Share as much of the list as you have - a drawing or sketch is enough to start.
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