Elastomer Bellow Seal

Compact, unitized, singlespring elastomer bellows seal for maximum durability and performance. Ideal for centrifugal, rotary and turbine pumps, compressors, chillers and other rotary equipment. Often found in waterbased applications such as wastewater treatment, potable water, HVAC, pool and spa.

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.

Astra Seals AS FBD Elastomer Bellow Single Spring Mechanical Seal. Single end, unbalanced, independent direction of rotation, single spring + elastomer bellow as compensation components. Replaces EagleBurgmann and John Crane mechanical seals. Inner diameter: 20 mm to 120 mm. Pressure: ≤4 MPa, Temperature: 20~120°C, Linear Speed: ≤15 m/s. Standards: ISO3069, GB6556, DINDesigned for clean water, sewage water, oil and other moderately corrosive fluids.

Astra Seals AS SDM Double End Back to Back Mechanical Seal. Double end, unbalanced, independent direction of rotation, rubber bellow, bellow transmission. Compact structure with good compatibility, stability and easy installation. Inner diameter: 12 mm to 100 mm. Pressure: 0~8 MPa, Temperature: 20~120°C, Linear Speed: ≤10 m/s. Standards: DIN24960, ISO3069, GBWidely used in oil and water circulation pumps, piping pumps, and vacuum pumps for sewage treatment and papermaking industries.