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Type 2874NE

Non-contacting, Non-elastomer Metal Bellows Outward Pumping Dual Gas Seal for High-temperature Applications

A new, highly reliable gas-lubricated API 682 (ISO 21049) qualified high-temperature, non-contacting mechanical seal that utilizes internally pressurized outward pumping spiral groove face technology with high-temperature seal features such as Inconel-welded metal bellows and non-elastomeric flexible carbon graphite secondary seals. This innovative design technology is ideally suited for reliably sealing high-temperature process fluids on rotating equipment up to 800°F/425°C and fluids requiring inert secondary seals. Innovative alternative to conventional wet contacting seals that permits reliable operation in high-temperature services. Fugitive emissions for Maximum Achievable Control Technology (MACT) compliance for sealing higher-temperature, volatile or hazardous fluids. API 682/ISO 21049 qualified. Elastomer-free seal handles a wide range of applications. Eliminates problems associated with coking barrier fluids and fouled heat exchangers.

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  • API 682/ISO 21049 qualified.
  • Centrifugal advantage: process fluid at the OD of the bellows.
  • Pressure-balanced design withstands full reverse pressurization.
  • Static secondary seals have high-temperature capability and eliminate the cost of expensive perfluoro elastomers.
  • Edge-welded metal bellows.
  • Dual mating ring arrangement meets API 682 design requirements.
  • Spiral groove technology for superior operating performance.
  • Eliminates problems with coking barrier fluids and fouled heat exchangers.


Temperature Limits

-100°F to 800°F/-75°C to 425°C

Pressure Limits

Vacuum to 230 psi(g)/16 bar(g)

(See Basic Pressure Ratings curve on Product Specification sheet.)

Speed Limits

1450 to 3600 rpm

For speeds outside this range, contact John Crane Engineering.

Recommended Applications

  • Process Pumps
  • Other Rotating Equipment

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