A PTFE Lined Butterfly Valve operates through a quarter-turn rotational mechanism to control fluid flow. Its design features a circular disc (butterfly) mounted on a rod, which rotates to align parallel or perpendicular to the flow direction. The PTFE lining provides chemical resistance and smooth operation, while the lightweight construction ensures low-pressure drop and high-pressure recovery. Installation requires spacing of at least 6 pipe diameters from other line elements for optimal performance. The valve is actuated via a handwheel or gearbox, enabling quick shut-off and flow regulation.
Key Points Explained:
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Quarter-Turn Rotational Mechanism
- The valve operates via a 90-degree rotation of the disc (butterfly) to open or close the flow path.
- When parallel to the flow, media passes freely; when perpendicular, flow is blocked.
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PTFE Lining Benefits
- The lamina PTFE lining offers exceptional chemical resistance, making the valve suitable for corrosive or abrasive fluids.
- PTFE reduces friction, ensuring smooth disc movement and minimal wear over time.
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Disc and Stem Configuration
- A metal disc is centered in the pipe and connected to an external actuator (e.g., handwheel or gearbox) via a rod (stem).
- The stem may pass through or behind the disc, depending on the design.
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Installation Requirements
- Must be installed at least 6 pipe diameters away from other line components to avoid turbulence and ensure proper flow regulation.
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Performance Advantages
- Lightweight: Easier to handle and install compared to other valve types.
- Low-Pressure Drop: Minimizes energy loss during flow.
- High-Pressure Recovery: Efficiently restores system pressure after flow restriction.
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Actuation Methods
- Manual operation via handwheel or automated with a gearbox for faster, more precise control.
- Gearboxes reduce the effort needed to rotate the disc, especially in high-friction scenarios.
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Comparison to Other Valves
- Unlike ball valves (which use a rotating ball) or plug valves (which use a cylindrical plug), butterfly valves offer a simpler, more compact design with faster actuation.
- PTFE lining differentiates it from unlined variants by enhancing durability and compatibility with harsh media.
This design balances efficiency, durability, and ease of use, making it a versatile choice for industries requiring reliable flow control.
Summary Table:
| Feature | Description |
|---|---|
| Quarter-Turn Mechanism | 90-degree rotation of the disc for quick flow control. |
| PTFE Lining | Provides chemical resistance and smooth operation for harsh media. |
| Disc & Stem Design | Metal disc connected to an actuator via a rod for precise flow regulation. |
| Installation | Requires 6 pipe diameters spacing to avoid turbulence. |
| Performance | Lightweight, low-pressure drop, and high-pressure recovery for efficiency. |
| Actuation | Manual (handwheel) or automated (gearbox) options for ease of use. |
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