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Flowserve Metal Bellow BX Seal

Metal Bellows Seals - BX

BRAND: Flowserve

BX Series balanced metal bellows seals are engineered to drive exceptional, long-term equipment reliability and lower energy consumption. They provide exceptional reliability in corrosive and non-corrosive fluids, especially fluids that crystallize or coke in atmospheric conditions. The BX Series is fully compliant with API 682 Type B requirements. Available in single and dual seal configurations.


  • General Industry
  • Chemicals
  • Water
  • Oil & Gas

industry sectors

  • Pulp & Paper
  • Basic (Organic & Inorganic)
  • Water
  • Downstream Processing

API 682

Operating Parameters

Pressure: up to 27.6 bar (400 psi)

Temperature: -40°C to 204°C (-40°F to 400°F)

Speed: up to 23 m/s (75 fps)

Sizes: 12.3 to 127 mm (0.483 to 5.000 inches)

Features & Benefits
  • Longer service life via 0.20 mm (0.008 inch) thick standard welded bellows for maximum resistance to corrosion, shaft vibrations and centrifugal forces
  • Optimal performance is attained by selecting from three standard seal face balances; the BXQ seal is high balanced for flashing hydrocarbon applications
  • Increased maintenance intervals due to a self-cleaning rotating bellows that replaces the need for springs and dynamic elastomers to lessen clogging vulnerabilities
  • Maintain the performance benefits of self-cleaning rotating bellows in dual pressurized Arrangement 3 seals with the BXB seal’s unique ID pressurized seal face balance

High balance low emission hydrocarbon design for specific gravities down to 0.45 with multi-port flush.  Standard API 682 Type B Arrangement 1 seal.

Inner bellows designed for ID pressurization with barrier fluid. Standard API 682 Type B Arrangement 3pressurized dual seal.

Designed to international standard DIN EN 12 756 L1k for use in DIN pumps.

Arrangement 1 single seal (Common Piping Plans 11, 13, 23, 32, 62)

Arrangement 2 unpressurized dual wet seal (Common Piping Plans 52)

Arrangement 2 unpressurized dual seal with dry running backup (Common Piping Plans 72, 75, 76)

Arrangement 3 pressurized dual wet seal (Common Piping Plans 53A, 53C)

Arrangement 3 pressurized dual wet seal (Common Piping Plans 53B, 54)


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