10 Magnetic Seal Manufacturers in 2023
This section provides an overview for magnetic seals as well as their applications and principles. Also, please take a look at the list of 10 magnetic seal manufacturers and their company rankings.
Table of Contents
What Is a Magnetic Seal?
A magnetic seal is a sealing unit for rotary motion, which seals using a magnetic fluid attracted by a magnet. It is a type of rotary seal and is sometimes referred to as a magnetic fluid seal or vacuum seal.
A rotating seal—seals the hydraulic fluid that allows equipment to function over the long term.
Magnetic seals cannot seal liquids other than magnetic fluid, i.e., they cannot block or prevent leakage of other liquids such as water or oil. They are mainly used in atmospheres, gases, and vacuums.
Uses of Magnetic Seals
Since seals themselves are used in machinery and equipment, magnetic seals are used in mechanical engineering.
Magnetic fluidic seals are mainly used in the bearings of HDDs in personal computers and other hardware, where they improve durability and reduce noise from rotation.
Magnetic seals use rare earth magnets, which have a strong magnetic field that strongly holds the magnetic fluid.
Vacuum seals that can maintain a difference of 1 atmospheric pressure are used for CVD equipment, RVD equipment, ion implantation equipment, etc.
Principle of Magnetic Seals
Magnetic seals are highly functional among seals because they are rotating seals that require almost no maintenance and have low leakage.
The following is an explanation of how magnetic fluidic seals are made:
First, a magnetic fluid is held in the gap between the rotating shaft and the ball piece along the magnetic flux lines.
Because it is held by the magnetic flux lines, the fluid O-ring is formed without flowing out, even if there is a pressure difference.
The stronger the magnetic force, the greater the pressure resistance of the magnetic fluid.
Generally, magnetic fluid seals are designed with 10 to 20 stages, and by forming multiple stages, a magnetic fluid seal with a large pressure resistance is completed.
Here is why maintenance is almost never required.
Magnetic seals, due to the nature of magnetic fluid, do not cause friction even when rotating, as magnets hold the magnetic fluid in place around the axis of rotation. Since there is no friction, there is no wear and tear.
Therefore, the maintenance cycle is very long, resulting in a long-life seal.
In addition, the seal can be maintained even under severe conditions by properly setting the base oil of the magnetic seal and by introducing cooling water into the inside of the seal.
List of 10 Magnetic Seal Manufacturers
*Including some distributors, etc.
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- Company Size: largest first
- Year Founded: oldest first
- Year Founded: earliest first
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- United States of America
- Japan
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Industrial Magnetics, Inc.
SEALS AND GASKETS
Company Overview
Industrial Magnetics Inc (IMI) was established in 1961 and is based in Boyne City, Michigan. IMI is a producer for magnetic products used in various industries such as fabrication, automotive, conveying, recycling, stamping, welding, mining & aggregate, and grain. Product offerings include magnetizers, demagnetizers, conveyor systems, magnetic conveying rail, manhole cover lift systems, raw magnetic material, lift devices, conveyor and pneumatic line magnets, magnetic inspection probes, as well as numerous magnetic tools.
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Rigaku Corporation
MAGNETIC FLUID SEALS
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Magnetic Seal Manufacturer Ranking
*Including some distributors, etc.Number of Employees
- Eagle Industry Co., Ltd.: 6,507
Newly Established Company
- Ergoseal, Inc.: 1989 (34 years ago)
- Eagle Industry Co., Ltd.: 1964 (59 years ago)
- Sealing Devices Inc.: 1963 (60 years ago)
Company with a History
- MAGSEAL: 1954 (69 years ago)
- Sealing Devices Inc.: 1963 (60 years ago)
- Eagle Industry Co., Ltd.: 1964 (59 years ago)
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