External Pressure Face Seal
Designed to prevent external pressure or media entering between two faces. This seal is used to seal corrosive media or gases, as well as vacuum conditions. The additional load of the helical spring provides a gas-tight seal even under fluctuating temperature cycles.
|Material||Operating Pressure up to||Maximum Pressure up to||Temperature||Surface Speed up to||Fluid, Media Compatability|
|Permachem xxxx||5,000psi (350bar) vacuum||10,000psi (700bar)||-328°F to 500°F (-200°C to 260°C)||0.3ft/s (0.1m/s) intermitten||vacuum service, aggressive chemicals, NACE service, chlorine service, cryogenic service, FDA (both contact and non-contact), fugitive emissions, as well as control fluids, hydraulic fluids, dry running in a wide range of gases|
|Material Permachem xxxx will be selected by AHPSeals to match your operating conditions.|
|*Important Note: Maximum values above depend on extrusion gap, clearances, seal material, media, temperatures, pressures, surface speed, dynamic running surface finish and working environment. Seals cannot be operated at their upper ratings at the same time. For pressure above 3.000psi (210bar)or temperature above 200°F (95°C), please contact engineering for seal material and hardware specification.|
Size Table (Inch)The standard range sizes listed below are the preferred sizes for new design applications. Seals are available for any size in 0.001inch increments, including functional range. Additionally, we offer any other seal size as required.
|A Diameter ||CS|
|Standard Range||Functional Range||Tolerance||*||D=||Tolerance||Tol +/-0.001||max.
|0.750- 1.749"||0.750 - 12.000"||+0/-0.002||0.140||A + 0.280||+0.001/-0||0.090||0.015
|1.750-3.449"||1.750 - 18.000"||+0/-0.002||0.188||A + 0.375||+0.002/-0||0.122||0.015
|3.500 - 8.999"||2.500 - 25.000"||+0/-0.002||0.281||A + 0.563||+0.002/-0||0.187||0.015
|9.000 - 20.999"||3.000 - 31.000"||+0/-0.004||0.375||A + 0.750||+0.003/-0||0.240||0.015
|21.000 - 30.999"||5.000" - 72.000"||+0/-0.005||0.375||A + 0.750||+0.004/-0||0.240||0.015
|≥31.000" ||consult AHPSeals engineering
|*Standard cross-sections (CS) listed and non-standard sizes can be provided for any size up to 63 inches. Surface finish: Sealing faces (L) ground, Ra 6-12µin (0.15-0.30µm). Housing (A,D) Ra 32-63µin (0.8-1.6µm). See Technical Info for more specific information.|
Seal Housing Drawing