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.
Joints de piston are installed in the bore to manage chamber pressure.
Joints de tige 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?
| Fonctionnalité | Joint de piston | Joint de tige |
|---|---|---|
| Emplacement | Alésage intérieur du cylindre | Cylinder head |
| Fonction | 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 joints anti-poussière for added protection in dirty environments.
Which Materials Are Best for Each Seal?
Meilleurs matériaux pour les joints de piston
| Matériel | Benefits | Cas d'utilisation |
|---|---|---|
| NBR | Flexible and low cost | General air cylinders |
| TPU | Résistant à l'usure | Automation systems |
| PTFE | Faible frottement | Cylindres à grande vitesse |
| FKM | Heat and chemical resistance | Industrial cylinders |
More info: Piston Seal Types & Materials
Meilleurs matériaux pour les joints de tige
| Matériel | Benefits | Cas d'utilisation |
|---|---|---|
| NBR | Budget-friendly | Low-speed cylinders |
| TPU | Long service life | Heavy-duty cycles |
| FKM | Environnements extrêmes | Chemical or high-temp use |
Explore options: Fabricant de joints toriques personnalisés
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?
- Utiliser PTFE ou TPU for high-speed or friction-prone systems
- Replace seals every 6–12 months
- Utiliser joints tampons to absorb pressure spikes
Où acheter des joints de piston et de tige de haute qualité ?
Nous fournissons :
- Rod seals, piston seals, buffer & wiper seals
- Matériaux : NBR, TPU, FKM, PTFE
- OEM specs and custom orders
📩 Courriel : [email protected]
📞 WhatsApp : +86 17622979498
Conclusion
Rod seals stop leaks along the rod; piston seals maintain pressure in the chamber. Use both for reliable pneumatic performance.
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