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.
Phớt piston are installed in the bore to manage chamber pressure.
Thanh niêm phong 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?
| Tính năng | Phớt piston | Thanh niêm phong |
|---|---|---|
| Vị trí | Bên trong lỗ xi lanh | Cylinder head |
| Chức năng | 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 phớt gạt bụi for added protection in dirty environments.
Which Materials Are Best for Each Seal?
Vật liệu tốt nhất cho phớt piston
| Vật liệu | Benefits | Trường hợp sử dụng |
|---|---|---|
| NBR | Flexible and low cost | General air cylinders |
| TPU | Chống mài mòn | Automation systems |
| PTFE | Ma sát thấp | Xi lanh tốc độ cao |
| FKM | Heat and chemical resistance | Industrial cylinders |
More info: Piston Seal Types & Materials
Vật liệu tốt nhất cho phớt thanh
| Vật liệu | Benefits | Trường hợp sử dụng |
|---|---|---|
| NBR | Budget-friendly | Low-speed cylinders |
| TPU | Long service life | Heavy-duty cycles |
| FKM | Môi trường khắc nghiệt | Chemical or high-temp use |
Explore options: Nhà sản xuất vòng chữ O tùy chỉnh
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?
- Sử dụng PTFE hoặc TPU for high-speed or friction-prone systems
- Replace seals every 6–12 months
- Sử dụng đệm niêm phong to absorb pressure spikes
Mua phớt piston và thanh truyền chất lượng cao ở đâu?
Chúng tôi cung cấp:
- Rod seals, piston seals, buffer & wiper seals
- Vật liệu: NBR, TPU, FKM, PTFE
- OEM specs and custom orders
📩 Email: [email protected]
📞 WhatsApp: +86 17622979498
Phần kết luận
Rod seals stop leaks along the rod; piston seals maintain pressure in the chamber. Use both for reliable pneumatic performance.
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