Teflon lip seals are secured primarily through a clamping mechanism between metal cases, ensuring pressure maintenance and proper functionality. The outer case is press-fit into the bore to prevent rotation, while the inner case compresses internal components and locates the bend point of the sealing element. Additional components like gaskets and spacers further enhance sealing efficiency by preventing leakage and maintaining precise spacing. The PTFE (Teflon) element is mechanically formed to a smaller diameter than the shaft, utilizing hoop stress for effective sealing.
Key Points Explained:
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Clamping Mechanism:
- The body of a teflon lip seal is typically secured by being clamped between two metal cases (outer and inner).
- This ensures uniform pressure distribution and prevents displacement during operation.
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Outer Case Function:
- Press-fit into the bore to prevent rotation and provide structural stability.
- Acts as the primary anchoring point for the seal assembly.
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Inner Case Role:
- Compresses internal components to maintain seal integrity.
- Locates the bend point of the PTFE element, optimizing sealing performance.
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Auxiliary Components:
- Gasket: Prevents internal leakage and compensates for manufacturing tolerances.
- Spacer: Maintains proper spacing between elements and helps position the bend point.
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PTFE Element Design:
- Mechanically formed to a smaller diameter than the shaft, leveraging hoop stress for a tight seal.
- The elasticity of PTFE ensures adaptability to shaft movements while maintaining sealing efficiency.
This multi-component approach ensures durability, leak prevention, and reliable performance in demanding applications.
Summary Table:
| Component | Function |
|---|---|
| Clamping Mechanism | Secures the seal between metal cases for uniform pressure distribution. |
| Outer Case | Press-fit into the bore to prevent rotation and provide stability. |
| Inner Case | Compresses internal components and locates the PTFE bend point. |
| Gasket | Prevents leakage and compensates for tolerances. |
| Spacer | Maintains spacing and optimizes PTFE positioning. |
| PTFE Element | Mechanically formed smaller than the shaft for hoop stress-based sealing. |
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