BX Metal Bellow Seal API682

BX Metal Bellow Seal

Flowserve’s BX Series API 682 Type B is a family of balanced metal bellows seals available in single and dual seal configurations. BX Series seals provide exceptional reliability in corrosive and non-corrosive fluids, especially fluids that crystalize or coke in atmospheric conditions. The BX Metal Bellow Seals is fully compliant with API 682 Type B requirements.

Balanced, rotating welded metal bellows seal for corrosive and non-corrosive services with specific gravity of .45 and higher. Fully complies with API 682 type B specifications for refinery and petrochemical applications. The BX seal is available in single, double, and tandem seal configurations.

Metal Bellow Seal Specification

Standards:

API682

Features & Benefits

0.20 mm (0.008 inch) thick standard welded bellows provides maximum resistance to corrosion, shaft vibrations, and centrifugal forces
Rotating bellows acts to clear convolutions and prevent accumulation of debris.
Absence of springs and dynamic elastomers reduces clogging vulnerabilities.
Circulating device integrated into the dual seal cartridge circulates barrier fluid to keep the seal faces cool. A circulating device is also available on single seals for fluids over 75°c (167°F)
Available multi-port flush distributes flush fluid evenly around the seal faces for uniform cooling.
Part interchangeability between single and dual seal arrangements minimizes inventory requirements and maximizes design flexibility.

Corrosive and Non-Corrosive Fluids Operating Parameters

Pressure	Up to 28 bar (400 psi) *Higher pressures available for selected sizes.
Temperature	-40 – 204°C (-40 to 400°F)
Specific Gravity	0.45 and higher
Surface Speed	Up to m/s (75 fps)
Shaft Sizes	12.3 to 152.4 mm (0.483 to 6.000 inch)

Industrial Applications

Specialized Design for Specific Applications

BXQ	High balance low emission hydrocarbon design for specific gravities down to 0.45 with multi-port flush.
BXB	Inner bellows designed for ID pressurization with barrier fluid. Standard API 682 Type B Arrangement 3 pressurized dual seal.
BXLS	Designed for international standard DIN EN 12 756 L1k for use in DIN pumps.
BXR	Stationary bellows design capable of speeds up to 40 m/s.

BX Metal Bellow Seal API682