Questions You Should Know about cassette seal manufacturer

For more information, please visit our website.

Cassette seals play a critical role in various industries and applications where they provide reliable protection against dirt, dust, and other contaminants. Given their profound impact on equipment longevity and efficiency, it's essential to understand the common questions and latest insights in this domain. Here are some frequently asked questions about cassette seals.

1. What is a retainer plate (cover plate), and why is it required with an all-rubber split seal?

A cover plate is a piece of metal or another rigid material that is installed after the oil seal has been placed into the housing bore. The cover plate compresses the oil seal into the housing, ensuring optimal sealing capability. All-rubber split seals require cover plates because they lack outer reinforcement and need the compression inside the housing to stay in place effectively.

2. Which direction should the lip face when installing my oil seal?

A single lip seal is designed to seal in one direction. The primary sealing lip should face toward the media that needs sealing, such as grease or oil lubrication. If the seal functions as an excluder to keep out contaminants, it should face outward. Some seals come with dual lips to provide extra protection.

3. Which rubber material should I select for my oil seal?

Material selection is crucial for sealing performance. One commonly used material is nitrile (NBR), suitable for temperatures up to 200°F. For higher temperatures, materials like carboxylated or hydrogenated nitrile (HNBR) and fluoroelastomer (FKM) can be used. For applications involving chemicals, more compatible materials like FKM or PTFE are recommended.

4. Which lip seal material(s) should I use if my application requires FDA compliance?

For food and beverage industry applications, FDA compliance is essential. FDA compliant lip materials include FDA Silicone, FDA Viton, and certain PTFE formulations. For metal cases, 316SS is required. Seals must also withstand cleaning chemicals and high temperatures associated with these processes.

5. Which lip seal material or design might be recommended for an application with harsh chemicals?

With applications exposed to harsh chemicals, PTFE lip seals offer the best compatibility due to their chemical resistance. PTFE seals are also suitable for high pressures and dry running conditions and can be installed in traditional oil seal grooves.

6. Should I select a seal with a metal case or rubber outer diameter (OD)?

Seals with metal cases have a tighter fit but can cause housing damage. Rubber OD seals are easier to install without damaging the housing and can better seal any pre-existing housing damage. They also do not rust, unlike metal-cased seals.

7. I have removed my leaking oil seal from the equipment. How do I know what size oil seal I need?

Do not measure the used seal; it will give inaccurate results. Instead, provide the seal manufacturer with the equipment's shaft diameter, bore diameter, and bore depth. Often, the oil seal itself will have these specifications stamped on it.

8. How are oil seals measured?

Generally, users provide the shaft diameter, bore diameter, and bore depth to size a seal. For verification, the inside diameter (ID), outside diameter (OD), and width can be measured using specialized equipment like a pi tape and calipers.

9. Does oil seal thickness matter?

As long as the seal fits the shaft and bore diameters, the width is less critical. However, if the seal is too wide, it might interfere with surrounding equipment, and if it's too narrow, gasket spacers might be needed to ensure proper compression.

xtnbk are exported globally, serving diverse industries with a commitment to quality. Our mission is to deliver high-value products to our customers. Let's create a better future together.

10. What is the purpose of the spring used in oil seals?

The spring provides loading around the sealing circumference, keeping the lip tight against the shaft surface. Different designs like garter springs and finger springs offer specific benefits and risks, including potential equipment damage if dislodged during installation.

11. How long does an oil seal last?

Seal life varies based on operating conditions. Ideal conditions are rare, and real-world factors like speed, temperature, pressure, and contaminants drastically impact seal longevity.

12. I replaced my oil seal and found the shaft grooved underneath the lip. What causes this, and what should I do?

Shaft grooving usually results from improper hardness or finish. Installing a new seal over a grooved shaft can lead to leaks. Solutions include using a shaft sleeve or positioning the new seal lips away from the grooved area.

13. Should I glue the ends of my split seal back together during installation?

Generally, it is not recommended to glue the split ends of seals back together due to the difficulty of achieving proper lip alignment and potential compatibility issues with adhesives.

Contact us to discuss your requirements with a cassette seal manufacturer. Our experienced sales team can help you identify the options that best suit your needs.