AS H74
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: ≤1.6 MPa, Temperature: -20~200°C, Linear Speed: ≤20 m/s. Standards: DIN24960, ISO3069, GB6556. Widely used in chemical processing, oil refining, petrochemical engineering, sewage treatment, pharmacy and food production.
Materials
Rotary Face / Stationary Face / Elastomer / Spring / Metal Parts
SiC/TC (Rotary) / Carbon/SiC/TC (Stationary) / NBR/EPDM/Viton/FFKM (Elastomers) / SS304/SS316/PH17-4/HC-276 (Springs) / 410S/SS304/SS316/SS316L/Hastelloy (Metal Parts)
1 Variant
| Model | Materials | GA |
|---|---|---|
| H74 | SiC/TC (Rotary) / Carbon/SiC/TC (Stationary) / NBR/EPDM/Viton/FFKM (Elastomers) / SS304/SS316/PH17-4/HC-276 (Springs) / 410S/SS304/SS316/SS316L/Hastelloy (Metal Parts) | — |
Operating Conditions & Materials
Pressure
1.6 MPa or less
Temperature
-20 ~ 200 ºC
Linear Speed
20 m/s or less
Mediums
Oil, water, acid, alkali, organic solvents and subjects that are easy to be crystallized or have granules and high viscosity.
Customization Available
Changes of materials for getting other operating parameters are possible. Contact us with your requirements.
Related Products
AS H75
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.
AS H76
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.
AS 8B1D
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.
Explore Related Mechanical Seal Categories
Compare adjacent seal types to find the best fit for your service conditions, pressure and temperature range.
Spring Pusher Seal
Universal and OEM cartridge seals for pumps, compressors, and general rotating equipment.
Bellow Seal
Metal and PTFE bellow seals for high-temperature, high-pressure, and corrosive applications.
Elastomer Bellow Seal
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.
Support System
Seal support systems including API Plan 52/53 vessels, cyclone separators, flow units, and barrier liquid boosters.