Low-Friction Heavy-Duty Hydraulic Rod Buffer Seal
Uni-directional rectangular energizer ensures positive seal, designed to protect primary rod seals from pressure spikes with minimal impact on system friction. The small axial seal height reduces gland height, weight and cost.
|Material||Operating Pressure up to||Maximum Pressure up to||Temperature||Surface Speed up to||Fluid, Media Compatability|
|Permachem 6643||3,800psi (260bar)||5,000psi (350bar)||-40°F to 400°F (-40°C to 210°C)||13ft/s (4m/s)||mineral oil-based fluids, fire-resistant water-based hydraulic fluids including HFA and HFB, biodegradable fluids, vegetable oils, bio-diesels, and most modern hydraulic fluids|
|Permachem 6150||5,000psi (350bar)||6,000psi (420bar)||-40°F to 400°F (-40°C to 210°C)||13ft/s (4m/s)||same as Permachem 6643|
|Additional standard materials available: PTFE, filled PTFE®, engineered thermoplastics, high-performance polyurethanes, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Aflas®, Hytrel®, Silicone, low- and high-temperature, FDA-compliant seal material grades and proprietary specialized Duralast™, Duraloy™, and Permachem™ materials.|
|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. Pressure ratings can be increased by reducing clearances. For pressure above specified operating pressure, surface speed above 5ft/s (1.3m/s), or for any advice, please contact email@example.com|
Size Table (Inch)The standard range sizes listed below are the preferred sizes for new design applications. Seals are available for any rod size in 0.001inch increments, including functional range. Additionally, we offer any other seal size as required.
| B* |
| C ||R1 ||R|
|Standard Range||Functional Range||Tolerance|| D=||B=||D,B||Tol.+0.008/-0||min.||max.||max.
|0.125 - 0.311"||0.125 - 1.500"||+0/-0.001||0.097||A + 0.194||A + 0.024||+0.001/-0||0.087||0.080||0.015||0.006
|0.312 - 0.749"||0.312 - 2.500"||+0/-0.002||0.143||A + 0.286||A + 0.026||+0.002/-0||0.126||0.050||0.015||0.008
|0.750 - 1.499"||0.750 - 8.000"||+0/-0.003||0.210||A + 0.420||A + 0.027||+0.003/-0||0.165||0.070||0.020||0.008
|1.500 - 7.999"||1.500 - 10.500"||+0/-0.003||0.297||A + 0.594||A + 0.029||+0.003/-0||0.248||0.100||0.040||0.008
|8.000 - 9.999"||5.000 - 26.500"||+0/-0.004||0.403||A + 0.806||A + 0.030||+0.004/-0||0.319||0.130||0.050||0.008
|10.000 - 26.500"||10.000 - 40.000"||+0/-0.005||0.473||A + 0.946||A + 0.034||+0.005/-0||0.319||0.130||0.050||0.008
|> 26.500" ||consult with Ahpseals engineering
|* Based on using wear rings. For pressure above 3,800psi, please contact engineering for clearances. For rod diameter below 0.475" open or split housing is recommended.
Surface finish: rod (A) Ra 4-12µin – Static (D,L) Ra max. 32µin. See Technical Info for more specific information.