BIA (also known as Type 21 or Type 43) Mechanical Seal for Clean Water Pumps, Piping Pumps and Vacuum Pumps. Single end, unbalanced, independent direction of rotation, rubber bellow, bellow transmission. Compact structure with good compatibility, stability and easy installation. Can be an alternative to similar products from EG&G SEAL OL. Widely used in oil and water circulation pumps, piping pumps, and vacuum pumps for industries such as sewage treatment and paper-making.
Rotary Face / Stationary Face / Elastomer / Spring / Metal Parts
Carbon/SiC/TC / Al2O3/SiC/TC / NBR/EPDM/Viton / SS304/SS316
| Model | Materials | GA |
|---|---|---|
| BIA, Type 21, Type 43 | Carbon/SiC/TC / Al2O3/SiC/TC / NBR/EPDM/Viton / SS304/SS316 | — |
Pressure
0.8 MPa or less
Temperature
-20 ~ 120 ºC
Linear Speed
10 m/s or less
Mediums
Oil, water, weak acid and alkali and other corrosive mediums.
Customization Available
Changes of materials for getting other operating parameters are possible. Contact us with your requirements.

MG9 Mechanical Seal for Clean Water Pumps, Circulating Pumps and Vacuum Pumps. Single end, unbalanced, independent direction of rotation, rubber bellow transmission. Compact structure with good compatibility and easy installation. The rubber bellow design prevents possible radial runout so that the floatability of the rotary ring is increased. Can be an alternative to similar products from Eagle Burgmann. Widely used in centrifugal pumps, piping pumps, sewage pumps, immersible motors, screw pumps, vacuum equipment for sewage treatment, city water supply, chemical engineering, pharmacy, food processing, and paper making.
MG12 (G13) & U4801G12 (13) Mechanical Seal for Water Pumps, Submerged Motors, and Piping Pumps. Single end, unbalanced, dependent direction of rotation, rubber bellow transmission. Compact structure with good compatibility and easy installation. The bellow provides support against pressure to eliminate indentation and corrugation. Also known as KSB Part No. 433 mechanical seal. Can work as an alternative to similar EagleBurgmann products on KSB pumps. Widely used in water pumps, submerged motors, piping pumps, sewage pumps, vacuum equipment for sewage treatment, city water supply, chemical engineering, pharmacy, food processing, and paper making.
MG1, AKA 109, U4801 Mechanical Seal for Water Pumps, Centrifugal Pumps, Submerged Motors, Vacuum Pumps, and Piping Pumps. Single end, unbalanced, fixed direction of rotation, rubber bellow transmission. Compact structure with good compatibility and easy installation. The bellow and spring provide pressure compensation to the sealing faces. The rubber bellow design prevents radial runout so the floatability of the rotary ring is increased. Widely used in water pumps, piping pumps, sewage pumps, immersible motors, vacuum equipment for sewage treatment, city water supply, chemical engineering, pharmacy, food processing, and paper making.
Compare adjacent seal types to find the best fit for your service conditions, pressure and temperature range.

Universal and OEM cartridge seals for pumps, compressors, and general rotating equipment.

Elastomer bellow mechanical seals (rubber bellows) for HVAC, wastewater, clean-water, and light chemical pumps — direct John Crane Type 21 / Type 6A, Sepco 500 and EagleBurgmann MG1 replacements to ISO 3069 / DIN 24960.

High-performance mechanical seals for gas and process compressors, including metal bellow and cartridge designs.

Precision seals for high-speed pumps, Roots blowers, gearboxes, and rotating joints.