The swivel is where the fluid passes and one of the hardest-working parts of any reel. Here’s why the seal inside it matters, and the easiest way to choose the right one.
On a fluid reel, the swivel allows the reel to rotate while staying connected to the supply line. Every drop of water, air, oil, fuel, or chemical passes through it. Inside the swivel is a seal, and that seal is the component most responsible for keeping the reel operating leak-free.
Choose the right seal for the application, and the reel can provide years of reliable service. Choose the wrong one, and leaks, pressure loss, and premature wear are often the result.
Why Seal Selection Matters
The swivel/seal is the primary wear item on a fluid reel because it’s constantly under pressure and continuously exposed to the media flowing through it.
A seal that is compatible with the application remains flexible and maintains a tight seal. A seal that isn’t compatible may swell, harden, or deteriorate, leading to reduced performance and eventual failure.
The good news is that selecting the right seal comes down to a few simple questions:
What is running through the reel? What temperature is the media? And, what pressure are you operating at?
Matching the Seal to the Media
For most applications, Reelcraft’s standard HNBR (Hydrogenated Nitrile Butadiene Rubber) seal is the right choice. It is designed to handle:
- Hot and cold water
- Compressed air
- Petroleum oils
- Grease
- Fuel and diesel
It also performs across a broad temperature range, making it suitable for most industrial and commercial applications.
Some environments require something different. Aggressive chemicals, acetones, strong acids, and certain solvents can break down a standard HNBR seal and may require a seal specifically matched to that chemistry.
Temperature and Pressure Matter Too
Media compatibility is only part of the equation.
Every seal is designed to operate within specific temperature and pressure ranges. Excessive heat can shorten seal life, while operating beyond pressure limits can accelerate wear and increase the risk of failure.
For the longest service life, make sure the reel’s pressure and temperature ratings align with the application.
The Easy Way: Use the Seal & Media Compatibility Finder
You don’t need to memorize compatibility charts.
The Reelcraft Seal & Media Compatibility Finder uses the media compatibility information found in Tech Bulletin TB0002 to recommend a seal based on the media you enter. It’s a fast way to narrow down the options and identify a likely match for your application.
That said, the Finder is a recommendation tool, not a guarantee of compatibility. Variables such as media concentration, temperature, pressure, exposure time, and application-specific conditions can affect seal performance. For unusual applications, aggressive chemicals, or whenever there’s uncertainty, contact Reelcraft Customer Service (1-800-634-9109) for a final recommendation before purchasing.
Quick Answers
What does the swivel do? The swivel allows the reel to rotate while remaining connected to the supply line. The seal inside the swivel keeps the media contained and prevents leaks.
What seal works for water, air, and oil? For most water, air, petroleum oil, grease, fuel, and diesel applications, the standard HNBR seal usually does the job. Applications involving acetones, strong acids, or harsh solvents may require a different seal material. Use the Seal & Media Compatibility Finder or contact Reelcraft Customer Service (1-800-634-9109) for guidance.
Can the seal be replaced? Often, yes. The seal is designed as a serviceable component in many swivels, allowing it to be replaced as it wears and helping maximize the service life of the reel.
The Bottom Line
The swivel/seal has one of the toughest jobs on a reel. Matching the seal material to the media, while staying within the reel’s temperature and pressure ratings, is one of the simplest ways to maximize swivel life and avoid leaks. For most applications, the standard HNBR seal is the answer. For more demanding chemical environments, the key is selecting a seal designed specifically for the media being used.
