Flange Centerline Butterfly Valve
The Test Torque for a Flange Centerline Butterfly Valve typically depends on the Nominal Diameter (DN) and Pressure Rating (PN). Below is a general torque chart to help estimate the opening torque for different valve sizes and pressure ratings. These values are approximate and may vary depending on the specific design, materials, and manufacturer of the valve.
Flange Centerline Butterfly Valve
The Flange Centerline Butterfly Valve is a resilient-seated butterfly valve featuring a concentric (centerline) disc and stem design. The valve disc rotates around the center axis of the seat, providing reliable shut-off and flow regulation with low operating torque and compact structure.
Designed with flanged end connections, this valve offers secure installation, excellent sealing performance, and easy maintenance. It is widely used in water supply, wastewater treatment, HVAC systems, power generation, chemical processing, fire protection, and general industrial applications.
The soft-seated centerline design ensures bubble-tight sealing, making it an economical and reliable solution for low- to medium-pressure fluid control systems.
As a professional industrial valve manufacturer, we provide comprehensive OEM and ODM services for global customers and project contractors.
Body Materials
Disc Materials
Seat Materials
Stem Materials
Our products are manufactured under internationally recognized quality systems and valve industry standards.
Parameter Specifications
| Item | Specification |
|---|---|
| Product Name | Flange Centerline Butterfly Valve |
| Valve Type | Concentric / Centerline Butterfly Valve |
| Nominal Size | DN50–DN3000 (2"–120") |
| Pressure Rating | PN10, PN16, PN25 |
| Body Material | Ductile Iron, Cast Iron, Carbon Steel, Stainless Steel |
| Disc Material | Ductile Iron, SS304, SS316, Aluminum Bronze |
| Seat Material | EPDM, NBR, Viton, PTFE |
| Stem Material | SS410, SS420, SS304, SS316 |
| Connection Type | Double Flanged |
| Flange Standard | EN1092-2, ANSI B16.5, JIS, GB/T |
| Operating Temperature | -20°C to +180°C |
| Maximum Working Pressure | Up to 2.5 MPa |
| Leakage Rate | ISO 5208 Rate A (Zero Leakage) |
| Flow Direction | Bi-Directional |
| Operation Type | Lever, Gearbox, Pneumatic, Electric, Hydraulic |
| Design Standard | API 609, EN 593 |
| Face-to-Face Standard | EN 558 Series 13/14 |
| Inspection & Testing | API 598, EN 12266 |
| Surface Coating | Fusion Bonded Epoxy (FBE), Epoxy Powder Coating |
| Applicable Media | Water, Air, Gas, Oil, Wastewater, Chemicals |
Industry Applications
Material customization plan
Customized 316L stainless steel valves forGerman chemical enterprises. Resistant tostrong corrosion, suitable for their acidicmedium transportation systems, with aservice life extended to over 8 years.
Structural optimization design
For the Saudi desert project, the valve stemsealing structure was changed to a doublebellows design to address the leakage issuein the high-temperature and dustyenvironment, and it was highly recognizedby the customers.
Interface standard adaptation
Customized API 600 standard valves for acertain company in the United States. Theflange size is fully compatible with ANSIB16.5, ensuring zero error during on-siteinstallation and reducing the constructionperiod by 30%.
