670 672 676 680 Metal Bellow Seals Johncrane

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 designed as a dual seal using a non-pressurized buffer or pressurized barrier fluid. A pumping ring recirculates barrier fluid, assuring cooler operating temperatures and extended reliable performance.

The Type 675 and 676 provide the same performance benefits as the Type 670, but use different materials of construction. The Type 675, with a Titanium bellows, is ideal for chlorine, chlorine dioxide, and ferric chloride services. The Type 676, with an AM350 stainless steel bellows, is well-suited for mild corrosive and abrasive applications, such as miscellaneous water and paper stock.

The Type 680 is the ideal seal for general-purpose applications. Its Alloy-20 bellows provide corrosion resistance in a broad range of services. 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.