Special Seals

Astra Seals AS H75 Series Cartridge Mechanical Seal for Boiler Feed Pumps. Single end, multiple springs, balanced, independent rotary direction, coil driven. Simple and reliable transmission, easy to install with stable sealing performance and long life. Inner diameter: 50 mm to 200 mm. Pressure: ≤5 MPa, Temperature: ≤200°C, Linear Speed: ≤30 m/s. Standard: APIWidely used in boiler feed pumps for power plants, booster pumps and other medium pressure high speed applications.

Astra Seals AS H76 Single Spring Mechanical Seal for Mixers and Boiler Feed Pumps. Single end, single spring, balanced, independent rotary direction, coil driven. Simple and reliable transmission, easy to install with stable sealing performance and long life. Inner diameter: 50 mm to 200 mm. Pressure: ≤5 MPa, Temperature: ≤200°C, Linear Speed: ≤30 m/s. Standard: APIWidely used in boiler feed pumps for power plants, booster pumps and other medium pressure high speed applications.

Astra Seals AS 8B1D Mechanical Seal for Boiler Feed Pumps and Power Plants. Single end, multiple springs, balanced, independent rotary direction, coil driven. Simple and reliable transmission, easy to install with stable sealing performance and long life. Inner diameter: 50 mm to 200 mm. Pressure: ≤5 MPa, Temperature: ≤220°C, Linear Speed: ≤30 m/s. Standard: APIWidely used in boiler feed pumps for power plants, booster pumps and other medium pressure high speed applications.

Astra Seals AS H74 Multiple Spring Mechanical Seal. Single end, multi springs, unbalanced, independent direction of rotation, lug transmission. Easy to install with good compensation. Balanced loads on seal faces with stable and reliable sealing performance. Inner diameter: 20 mm to 300 mm. Pressure: ≤6 MPa, Temperature: 20~200°C, Linear Speed: ≤20 m/s. Standards: DIN24960, ISO3069, GBWidely used in chemical processing, oil refining, petrochemical engineering, sewage treatment, pharmacy and food production.

Astra Seals AS M74RD Double End Mechanical Seal, improved from traditional M74D. Double end, small spring, unbalanced, independent direction of rotation, drive sleeve transmission, back to back design. Transmission lug changed from sharp edges to rounded edges to reduce damage to rotary seal ring. Alternative to KSB and Kaiquan original seals. Inner diameter: 20 mm to 300 mm. Pressure: ≤6 MPa, Temperature: 20~180°C, Linear Speed: ≤20 m/s. Standards: DIN24960, ISO3069, GB

Astra Seals AS M74D Double End Mechanical Seal for Chemical Centrifugal Pumps, KSB/Kaiquan Water Pumps and Double Suction Pumps. Double end, small spring, unbalanced, independent direction of rotation, drive sleeve transmission, back to back design. Alternative to KSB and Kaiquan original seal components. Inner diameter: 20 mm to 300 mm. Pressure: ≤6 MPa, Temperature: 20~180°C, Linear Speed: ≤20 m/s. Standards: DIN24960, ISO3069, GB

Mechanical Seals CR (cartridge), CRA (cartridge), GRB and GRC for Grundfos Water Pumps. Single end, unbalanced, independent direction of rotation, cartridge shaft seals. GRB uses elastomer bellows. Inner diameters: 1032 mm. Pressure: ≤6 MPa, Temperature: 20~150°C, Linear Speed: ≤10 m/s. Specifically designed for Grundfos stamped stainless steel centrifugal pumps. Widely used in power plants, city water supply projects, and fire control.

Astra Seals AS SE Cartridge Mechanical Seal for Grundfos ST/SE/SLV/SEG Series Pumps. Single end, unbalanced, independent direction of rotation, cartridge shaft seal. Designed for waste water, unscreened raw sewage in heavyduty, municipal, utility and industrial applications. Inner diameters: 22 mm and 32 mm. Pressure: ≤2 MPa, Temperature: 30~210°C, Linear Speed: ≤18 m/s. Specifically designed for Grundfos ST/SE/SLV/SEG waste water pumps.

Astra Seals AS GRSA and GRSAINFK Mechanical Seal for Sewage Pumps. Single end, multiple still springs with spring protection, balanced, independent direction of rotation, bolt transmission, noncartridge seal. The springs are separated from the sealed mediums so that they will not be jammed. Multi spring structure makes sure the load on the sealing faces balanced. Compact structure with easy installation and reliable performance. Can work as an alternative to GormanRupp and Grundfos original seal product GRSA or replacing Type 891 mechanical seal. Inner diameters: 28 mm, 38 mm, 50 mm, 65 mm, 70 mm, 80 mm, 90 mm, 100 mm. Pressure: ≤6 MPa, Temperature: 20~120°C, Linear Speed: ≤15 m/s. Standards: DIN24960, ISO3069, GB6556, ENWidely used in sewage pumps, immersible pumps, paper pulp pumps and other rotary devices for industries such as city construction, mining, power plants and sewage treatment.

Astra Seals AS GLF Mechanical Seal for Grundfos Heavy Duty Submerged Sewage Pumps. Double end, multiple springs, unbalanced, independent direction of rotation, bolt transmission, noncartridge seal. Simple and reliable transmission with preassembled compensation components for easy installation. Balanced load on seal faces with great and stable sealing performance. Can work as an alternative to Grundfos original seal for its sewage and water pumps. Inner diameter: 30 mm to 140 mm. Pressure: ≤25 MPa, Temperature: 20~100°C, Linear Speed: ≤15 m/s. Widely used in sewage treatment and water supply applications.

Replacement mechanical seals for GormanRupp Pumps S range of Submersible Pumps and T range of Self Priming Pumps. Single end, single spring, balanced, independent direction of rotation. Models: T3/T4/T6, T8, TInner diameters: 25", 5", 875", 25", 75". Pressure: ≤2 MPa, Temperature: 30~210°C, Linear Speed: ≤18 m/s.

Astra Seals AS Gorman Rupp Component Seal — replacement mechanical seals for GormanRupp Pumps, water pumps, and submerged motor applications. Structural Features: double end, single spring, balanced, any direction of rotation, back to back design. Inner diameters: 5 inch and 875 inch. Pressure: ≤2 MPa, Temperature: 30~210°C, Linear Speed: ≤18 m/s. Mediums: water, waste water and sewage. Industrial Standards: Customized. Scopes of Application: mainly used in GormanRupp Pumps.