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JOHN CRANE MECHANICAL SEALS |
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 John Crane 680 - Low Temperature, General Duty Alloy-20 Metal Bellows Shaft Seal
The Type 680 is the ideal seal for general-purpose applications. Its Alloy-20 bellows provide corrosion resistance in a broad range of
services.
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Its cost-effective design, combined with a reliable performance history, has made the Type 680 a standard for low-temperature applications found in the chemical, water and wastewater, pulp and paper, and utility industries.
It is the seal of choice in sealing Refrigeration Compressors
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Quick specs
| Temperature |
-75°C to +290°C / -100°F to +550°F
(depending on material being used) |
| Pressure |
Vacuum to 25 bar / 360 psi |
| Speed |
Up to 25 m/s / 5,000 fpm |
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Features
Leader in Bellows Sealing Technology
Sealol Low-Temperature and High-Temperature bellows seals assure low emissions and optimized Mean-Time-Between-Planned-Maintenance
(MTBPM).
Superior Bellows Design
These seals are manufactured with a 45º tilt edge at the bellows inside diameter to disperse stresses and maximize operating life.
Superior Plate Shape
The plate shape used by John Crane Sealol is called a nesting ripple. With a three-sweep
radius, this plate design allows the bellows device to be flexed repeatedly without the metal being stressed beyond its endurance
limit.
Self-Cleaning Design
Rotating bellows throw off suspended particles that clog spring-type
seals. This self-cleaning action eliminates the need for external
flushing, filters or cyclone separators and their associated costs.
World-class Bellows Manufacture
Our bellows production facility has an outstanding manufacturing process with state-of-the-art
stamping,welding and testing technology.
Application Flexibility
A wide range of metallurgies, face combinations and packing materials are used to seal a variety of demanding
applications.
Advanced Research and Development
The Sealol bellows incorporate all of the design features resulting from key engineering
competencies, such as metallic thin shell methodology, tribology and fluid sealing
technology, and thin film/fluid mechanics.
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