seal Type 609 John crane
seal Type 609 John crane

Features mechanical seal type 609

  • California Residents: PROPOSITION 65 WARNING
  • John Crane edge-welded metal bellows in Alloy 718 or optional heat-treated AM350 SS.
  • DOUBLE-PLY for high-pressure applications.
  • High-temperature to 425°C/800°F.
  • API-682 qualified.
  • Available in dual and single cartridge arrangements.
  • Available with secondary containment.
  • Elastomer-free design with flexible carbon graphite secondary seals.
  • Seal face is available with premium-grade carbon, silicon carbide, or tungsten carbide

Recommended Applications type 609

  • Process pumps

About Mechanical seal type 609

The Type 609 is a high-temperature (to 425°C/800°F) rotating seal head assembly that incorporates all of the rugged features of the Type 604, but is intended for those demanding applications where a dependable, high-strength, rotating seal is preferred. A narrow cross-section design enables the Type 609 to fit in the most popular pumps without expensive and time-consuming seal chamber modifications. This makes it the ideal seal for heat transfer, hydrocarbon and other applications that commonly use pumps with limited seal chamber clearances. Typical applications include hot hydrocarbons, aqueous solutions, aromatic fractionation products, crude oil fractionation products and heat transfer fluids.

Design Features mechanical seal type 609

  • Edge-welded metal bellows
  • Elastomer-free design
  • Standard components
  • Available in single or dual cartridge arrangements
  • Available with a secondary containment seal
  • The Type 604 and Type 609 meet API 682 requirements
  • Available with double-ply bellows

Material mechanical seal type 609

  • Bellows: Alloy 718 (UNS N07718)
  • Insert/Primary Ring: Premium Carbon Grade/Silicon Carbide/Tungsten Carbide
  • Static Seals: Flexible Graphite
  • Shell/Primary Ring Adaptor: Alloy 42 (UNS K94100)
  • Adaptor: Alloy 625 (UNS N06625

Operating range mechanical seal type 609

Temperature Limits

-100°F to 800°F/-75°C to 425°C with flexible graphite static packing


Pressure Limits

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


DOUBLE-PLY: Vacuum to 1000 psi(g)/69 bar(g)


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


Speed Limits



Product Description type 609

Type 609 – High-temperature rotary bellows assembly with narrow cross-section design for easy fit.