Design: Single-lip oil seals have a single sealing lip that contacts the shaft, while double-lip oil seals have two sealing lips, with the outer lip designed to prevent contaminants from entering the machinery and the inner lip to retain lubricants.
Sealing Capabilities: Single-lip oil seals may not be as effective as double-lip seals in preventing contamination, as they have only one sealing surface. Double-lip oil seals offer improved sealing capabilities due to the presence of two sealing lips. The outer lip protects the seal from dust, dirt, and other contaminants, while the inner lip retains the lubricant and prevents it from leaking out.
Friction: Single-lip oil seals have lower friction, which allows them to be used in high-speed applications. Double-lip seals may have higher friction, which can limit their use in high-speed applications.
Cost: Single-lip oil seals are typically less expensive than double lip seals.
| Feature | Single-Lip Oil Seals | Double-Lip Oil Seals |
|---|---|---|
| Sealing Lips | Single | Double |
| Sealing Capabilities | Less effective against contamination | More effective against contamination |
| Friction | Lower | Higher |
| Cost | Less expensive | More expensive |
The choice of single lip and double lip oil seal depends on the specific application requirements, such as operating speed, pressure, temperature and pollutant exposure. Consulting the seal manufacturer (NNK) or engineer can help to ensure that the appropriate seal design is selected for a specific machine and application.
How well do you know the Valve Stem Seal?
Valve stem seals control oil consumption and lubricant in an engine by allowing a specific amount of oil inside the valve stem as it moves. A controlled amount of oil is crucial in maintaining adequate lubrication. Otherwise, too little oil can cause various components to wear as parts rub together.
View More
How to install an oil seal on a washer
Why is there an oil seal in the washer? Thanks to this element, water from the drum cavity is not allowed to enter the bearings. Diagnostics of an element and, if necessary, its replacement are rather labor-intensive procedures that require good skills and knowledge in the field of construction of an automatic machine.
View More
No matter if you are using O-rings for industrial use, a hobby project or for household maintenance, there are a variety of reasons as to why they can fail.↳ In order to help you understand why, and how to spot the differences in failures we have created an easy-to-follow guide that can help you prevent them in the future.
View More
End caps are designed for applications where the shaft does not pass through the housing wall of the bore. The end cap provides protection for the bearings. The covers are designed to fit into housing bores for rotary shaft seals. They have the same tolerances as those for the O.D.
View More
Will the power steering seal work if it is broken 