Type 670
Manufacturer: John Crane
Low temperature, All Alloy C 276 Metal Bellows Shaft Seal for Highly Corrosive Fluids
The Type 670 is an all Alloy C 276 rotating bellows seal, providing high strength and excellent corrosion resistance. It is extremely durable in applications where temperature and media (fluid) result in an aggressive environment. The Type 670 has been tested per API 682 Type B seals for low temperature refinery services. Other common applications include acids, caustics, amines and products with H2S, such as sour water and sour hydrocarbons. The Type 670 can be shaft mounted or is available in both dual and single cartridge arrangements. In dual seal arrangements a non pressurized buffer or pressurized barrier fluid can be used. A pumping ring recirculates barrier fluid, assuring cooler operating temperatures and extended reliable performance.
• Superior nesting ripple plate shape 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.
• The 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.
TEMPERATURE LIMITS100°F to 550°F/ 75°C to 290°C (depending on material being used)
PRESSURE LIMITSVacuum to 360 psi(g)/25 bar(g)
SPEED LIMITS5000fpm/25m/s