
Compact, unitized, single-spring elastomer bellows seal for maximum durability and performance. Ideal for centrifugal, rotary and turbine pumps, compressors, chillers and other rotary equipment. Often found in water-based applications such as wastewater treatment, potable water, HVAC, pool and spa.
Rotary Face / Stationary Face / Elastomer / Spring / Metal Parts
Multiple configurations: Viton, NBR, EPDM with Carbon, Ceramic or SiC faces
| Model | Materials | GA |
|---|---|---|
| 2100 Series | Multiple configurations: Viton, NBR, EPDM with Carbon, Ceramic or SiC faces | — |
Pressure
1.2 MPa or less
Temperature
-20 ~ 120 ºC
Linear Speed
10 m/s or less
Mediums
Oil, water, sewage, food and beverage, paper pulp and other weak-corrosion content.
Customization Available
Changes of materials for getting other operating parameters are possible. Contact us with your requirements.

Astra Seals AS 128 Rubber Bellow Mechanical Seal. Single end, rubber bellow + single spring, balanced, free rotary direction, spring coil driven. Simple structure, low cost, wide usage, stable and reliable. Can work with AS 110 as a double seal. Inner diameter: 20 mm to 100 mm. Pressure: ≤8 MPa, Temperature: 20~150°C, Linear Speed: ≤15 m/s. Standards: ISO3069, GB6556, DINWidely used in petrochemical engineering, oil refining, chemical processing, chemical fibering, water treatment and chemical transportation.

Astra Seals AS 502 Elastomer Bellow Mechanical Seal. Single end, balanced, independent direction of rotation, rubber bellow, bellow transmission. Easy to install with pressure compensation to sealing faces. Bellow design prevents radial runout, increasing rotary ring floatability. Replaces John Crane Type Inner diameter: 14 mm to 100 mm. Pressure: ≤4 MPa, Temperature: 20~120°C, Linear Speed: ≤13 m/s. Standards: ISO3069, GB6556, DINWidely used in centrifugal pumps, compressors and reaction kettles for painting and ink industries.

Astra Seals AS 110 Single Spring Elastomer Bellow Mechanical Seal. Single end, single spring, unbalanced, free rotary direction, spring coil driven. Simple structure, low cost, wide usage, stable and reliable. Can work with 128 seal as a double seal. Inner diameter: 35 mm to 100 mm. Pressure: ≤8 MPa, Temperature: 20~150°C, Linear Speed: ≤15 m/s. Standards: ISO3069, GB6556, DINWidely used in petrochemical engineering, oil refining, chemical processing, chemical fibering, water treatment and chemical transportation.
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.

Metal and PTFE bellow seals for high-temperature, high-pressure, and corrosive applications.

Heavy-duty mechanical seals for slurry pumps, FGD systems, and abrasive media applications.

Specialty and custom-engineered sealing solutions for unique applications and equipment.