Choosing the wrong seal can lead to air leaks and costly downtime.
A piston seal holds air pressure inside the cylinder; a rod seal prevents leaks along the rod. Both are critical but serve different purposes.
Here's how to select the right seal for your pneumatic application.
What’s the Main Difference Between a Piston Seal and a Rod Seal?
They operate in different areas of the cylinder.
Sellos de pistón are installed in the bore to manage chamber pressure.
Sellos de varilla are placed at the cylinder head to stop air leakage along the moving rod.
They work together to maintain system efficiency. See the full breakdown in our pneumatic cylinder seal guide.
What Are the Key Functional Differences?
| Característica | Sello de pistón | Sello de varilla |
|---|---|---|
| Ubicación | Diámetro interior del cilindro | Cylinder head |
| Función | Seals pressure between chambers | Prevents external air leakage |
| Movement | Static or dynamic | Always dynamic |
| Failure symptoms | Blow-by, reduced stroke | Visible air leak, reduced pressure |
Consider adding sellos limpiaparabrisas for added protection in dirty environments.
Which Materials Are Best for Each Seal?
Los mejores materiales para los sellos de pistón
| Material | Benefits | Caso de uso |
|---|---|---|
| NBR | Flexible and low cost | General air cylinders |
| TPU | Resistente al desgaste | Automation systems |
| Teflón | Baja fricción | Cilindros de alta velocidad |
| FKM | Heat and chemical resistance | Industrial cylinders |
More info: Piston Seal Types & Materials
Los mejores materiales para los sellos de vástago
| Material | Benefits | Caso de uso |
|---|---|---|
| NBR | Budget-friendly | Low-speed cylinders |
| TPU | Long service life | Heavy-duty cycles |
| FKM | Entornos extremos | Chemical or high-temp use |
Explore options: Fabricante de juntas tóricas personalizadas
When Should You Use a Piston Seal vs. a Rod Seal?
Use a piston seal for internal chamber sealing.
Use a rod seal to seal around the moving piston rod.
In most cylinders, you’ll use both. For comparison: Piston vs Rod Seal
How to Prevent Common Seal Failures?
- Usar PTFE o TPU for high-speed or friction-prone systems
- Replace seals every 6–12 months
- Usar sellos de amortiguación to absorb pressure spikes
¿Dónde comprar sellos de pistón y varilla de alta calidad?
Suministramos:
- Rod seals, piston seals, buffer & wiper seals
- Materiales: NBR, TPU, FKM, PTFE
- OEM specs and custom orders
📩 Correo electrónico: [email protected]
WhatsApp: +86 17622979498
Conclusión
Rod seals stop leaks along the rod; piston seals maintain pressure in the chamber. Use both for reliable pneumatic performance.
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