Features mechanical seal type 670

  • California Residents: PROPOSITION 65 WARNING
  • Static secondary seal — available in single or dual arrangements, shaft mounted or in a cartridge; manufactured with a 45-degree tilt edge at the bellows’ inside diameter to disperse stresses and maximize operating life.
  • 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.

About Mechanical seal type 670

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.

Design Features mechanical seal type 670

  • Edge-welded metal bellows
  • Static secondary seal
  • Standard components
  • Available in single or dual arrangements,
    shaft-mounted or in a cartridge
  • The Type 670 meets API 682 requirements

Material mechanical seal type 670

  • Face/Primary Ring: Carbon
  • Retainer/Disc/Drive Band/ Spring Holder: 18-8 Stainless Steel
  • Bellows: Buna-N
  • Springs: 18-8 Stainless Steel

Recommended Applications type 670

  • Process pumps
  • Other compressors
  • Other rotating equipment

Operating range mechanical seal type 670


Temperature Limits

-100°F to 550°F/-75°C to 290°C (depending on material being used)


Pressure Limits

Vacuum to 360 psi(g)/25 bar(g)


Speed Limits



Product Description type 670

Type 670: All-alloy C-276 high-strength low-temperature bellows assembly for highly corrosive applications.