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.
Selos de pistão are installed in the bore to manage chamber pressure.
Vedações de haste 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?
| Recurso | Selo do pistão | Selo de haste |
|---|---|---|
| Localização | Furo interno do cilindro | Cylinder head |
| Função | 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 vedações do limpador de pó for added protection in dirty environments.
Which Materials Are Best for Each Seal?
Melhores materiais para vedações de pistão
| Material | Benefits | Caso de uso |
|---|---|---|
| NBR | Flexible and low cost | General air cylinders |
| TPU | Resistente ao desgaste | Automation systems |
| PTFE | Baixo atrito | Cilindros de alta velocidade |
| FKM | Heat and chemical resistance | Industrial cylinders |
More info: Piston Seal Types & Materials
Melhores materiais para vedações de haste
| Material | Benefits | Caso de uso |
|---|---|---|
| NBR | Budget-friendly | Low-speed cylinders |
| TPU | Long service life | Heavy-duty cycles |
| FKM | Ambientes extremos | Chemical or high-temp use |
Explore options: Fabricante de O-Ring personalizado
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 ou TPU for high-speed or friction-prone systems
- Replace seals every 6–12 months
- Usar selos de proteção to absorb pressure spikes
Onde comprar retentores de pistão e biela de alta qualidade?
Nós fornecemos:
- Rod seals, piston seals, buffer & wiper seals
- Materiais: NBR, TPU, FKM, PTFE
- OEM specs and custom orders
📩 E-mail: [email protected]
📞 WhatsApp: +86 17622979498
Conclusão
Rod seals stop leaks along the rod; piston seals maintain pressure in the chamber. Use both for reliable pneumatic performance.
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