Project-configured welded butterfly valves for industrial ventilation, flue gas, gas handling, marine ventilation and custom OEM requirements.
Start with the geometry and project approach that best matches the operating duty, then confirm materials, sealing, connections and actuation based on the submitted conditions.
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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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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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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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.
View Product 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 ProductThis comparison is an initial navigation aid. Final suitability remains subject to the actual medium, pressure, temperature, shutoff duty and installation requirements.
| Series | Geometry / Type | 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 |
The application context helps identify a relevant series, while the final valve construction remains tied to the submitted operating and installation conditions.
Ventilation, exhaust, dust collection and treatment-duct duties.
VDF-25C / VDF-25D / VDF-25TIndustrial ventilation, gas handling and abrasive-service review.
VDF-25C / VDF-25TFlue gas, exhaust and low-pressure process-duct applications.
VDF-25C / VDF-25D / VDF-25TMedium-specific materials, sealing and actuation options subject to project review.
VDF-25D / VDF-25T / VDF-25CSDuct isolation, compartment separation and remote-operation requirements.
VDF-25B / VDF-25CSNon-standard welded valve projects start with the service conditions, installation interfaces and customer documents available for engineering review.
Collect the medium, pressure, temperature, dimensions, connection, sealing and actuation requirements.
Evaluate the structure, materials, sealing approach and actuator interface against the stated conditions.
Confirm overall dimensions, connection dimensions, materials and key technical requirements.
Define manufacturing and inspection requirements based on the confirmed project documents.
Confirm marking, packaging, accompanying documents and transportation requirements.
JNS combines long-term valve machining experience with drawing-based project review for welded butterfly valve applications.
Wenzhou Jinnaisi Valve Co., Ltd. is based in Wenzhou, Zhejiang, China. Valve machining experience began in 1990, while the company completed its business registration in 2001.
The company focuses on butterfly valve machining and fabrication, OEM supply and non-standard project support based on submitted operating conditions and drawings.
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Product selection and configuration are reviewed against the submitted operating conditions and project requirements.
