DN250 PN10/16 Flanged Gear-Operated Butterfly Valve
Description
DN250 PN10/16 Flanged Gear-Operated Butterfly Valve – Technical Data Sheet
1. General Information
| Item | Description / Parameters |
|---|---|
| Product Name | Flanged Butterfly Valve (Gear-Operated) |
| Nominal Size | DN250 (10″) |
| Pressure Rating | PN10 / PN16 (As indicated on the nameplate) |
| Connection Type | Double Flanged (Flanged Ends) |
| Operation | Manual Gearbox with Handwheel |
| Body Color | Blue Epoxy Coating (Standard industrial anti-corrosion) |
| Applicable Media | Water, wastewater, seawater, air, steam, and other neutral or mildly corrosive fluids (depending on seat material) |
| Applications | Water treatment, HVAC, chemical processing, power plants, and general industrial pipelines. |
2. Materials of Construction (Typical)
Note: Materials are inferred based on standard industry practices for this type of valve. Exact materials should be confirmed with the manufacturer.
| Part Name | Material (Reference) |
|---|---|
| Body | Ductile Iron (GGG40 / QT450-10), Epoxy Coated |
| Disc | Ductile Iron (Nickel Plated) or Stainless Steel (CF8/CF8M) |
| Stem | Stainless Steel (SS416, SS304, or SS316) |
| Seat (Liner) | EPDM, NBR, or PTFE (Replaceable / Bonded) |
| Gearbox Housing | Cast Iron / Ductile Iron, Black Painted |
| Handwheel | Carbon Steel / Cast Iron |
| Fasteners | Stainless Steel / Zinc Plated Carbon Steel |
3. Nameplate Data (Confirmed from Images)
| Parameter | Value |
|---|---|
| Nominal Diameter | DN 250 |
| Nominal Pressure | PN 10 / PN 16 |
| Operator Type | Gearbox with Handwheel (90° rotation) |
4. Dimensional Data (Reference for DN250 PN16)
Note: Dimensions are standard reference values. Actual dimensions may vary by manufacturer and standard (e.g., EN 558, API 609).
| Symbol | Description | Reference Value (mm) |
|---|---|---|
| DN | Nominal Diameter | 250 |
| L | Face-to-Face Length | 68 (EN 558 Series 13) / 71 (API 609) |
| φD | Flange Outer Diameter | 405 (PN16) / 395 (PN10) |
| φK | Bolt Circle Diameter | 355 (PN16) / 350 (PN10) |
| n-φd | Bolt Holes | 12 – φ26 (PN16) / 12 – φ22 (PN10) |
| H | Center to Handwheel Top | Approx. 350~450 (Depends on gearbox design) |
| Weight (Approx.) | — | 40~55 kg |
5. Performance Specifications
| Item | Parameter |
|---|---|
| Nominal Pressure | 1.0 MPa (PN10) / 1.6 MPa (PN16) |
| Shell Test Pressure | 1.5 MPa (PN10) / 2.4 MPa (PN16) |
| Seat Test Pressure | 1.1 MPa (PN10) / 1.76 MPa (PN16) |
| Leakage Class | Bubble-tight (Soft-seated) |
| Operating Torque | Approx. 150~300 N·m (Depends on pressure and seat material) |
| Temperature Range | -20°C to +120°C (Depending on seat material: EPDM/NBR) |
| Operation | 90° open/close via gearbox, self-locking mechanism |
6. Applicable Standards (Typical)
| Category | Standard |
|---|---|
| Design & Manufacture | API 609 / EN 593 / MSS SP-67 |
| Face-to-Face | API 609 / EN 558 / ISO 5752 |
| Flange Connection | EN 1092-2 (PN10/16) / ASME B16.5 Class 150 |
| Pressure Testing | API 598 / EN 12266-1 |
| Coating | Epoxy Resin, DFT ≥ 250μm |
7. Design Features
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Gearbox Operation: The handwheel is connected to a gearbox, which multiplies torque and reduces operating effort, making it suitable for larger sizes like DN250.
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Flanged Connection: Double-flanged design allows for secure connection to pipeline flanges and is less prone to leakage compared to wafer-style valves.
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Self-Locking Gearbox: The gearbox is typically self-locking, preventing the disc from moving due to fluid flow or vibration when the handwheel is released.
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Anti-Corrosion: The blue epoxy coating on the body provides excellent protection against rust and corrosive environments.
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ISO 5211 Top Flange: The gearbox is mounted on an ISO 5211 top flange, allowing for easy replacement with pneumatic or electric actuators if needed.
8. Installation & Maintenance Notes
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Flange Matching: Ensure the mating flanges match the PN10/PN16 standard (EN 1092-2) or ASME B16.5 Class 150, depending on your pipeline standard. DN250 PN16 requires 12 bolts (usually M20 or M24).
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Installation Orientation: The valve can be installed in any orientation. However, for optimal sealing, it is recommended to install the valve with the stem horizontal or vertical, and ensure the flow arrow on the body matches the pipeline flow direction.
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Clearance: Ensure there is adequate space around the handwheel for manual operation (typically 360° rotation).
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Commissioning: Before installation, cycle the valve open and closed via the handwheel to ensure smooth operation. Do not use excessive force on the handwheel.
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Maintenance: Regularly inspect the gearbox for grease leakage. The seat can typically be replaced without removing the valve from the pipeline (if it’s a replaceable liner design), but always consult the manufacturer’s manual.
9. Ordering Information
To ensure you receive the correct valve, please provide the following information when ordering:
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Nominal Size: DN250 (10″)
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Pressure Rating: PN10 or PN16
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Body Material: Ductile Iron / Cast Steel / Stainless Steel
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Disc Material: Ductile Iron Nickel Plated / SS304 / SS316
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Seat Material: EPDM / NBR / PTFE / FKM
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Connection Standard: EN 1092-2 / ASME B16.5
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Operation: Gearbox with Handwheel (Standard)
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Special Requirements: (e.g., WRAS, FDA, anti-static, fire-safe)
Disclaimer: This data sheet is compiled based on visual inspection of the provided images and standard industry specifications for DN250 PN10/16 flanged butterfly valves. Exact dimensions, materials, and performance data may vary by manufacturer. Please confirm all critical parameters with the original equipment manufacturer (OEM) before procurement or installation.
