Buffer Seals
Buffer Seals
For linear and reciprocating dynamic sealing applications
Buffer seals are typically uni-directional rod seals that work in conjunction with the secondary rod seal to absorb pressure spikes.
The primary buffer seal provides the majority of the rod sealing performance while allowing fluid to pass by onto the secondary rod seal. At the same time, they enable trapped fluid sealed by the secondary rod seal, which is downstream of the buffer seal, to be pumped back into the system on the return stroke. When a buffer seal is used in combination with one of our Long-Life Rod Seals, the resulting sealing system provides long life with an exceptionally dry rod. Buffer seals are typically used for rod seal application only.
High-Pressure Buffer Seals up to 5,000psi (350bar)*
Typical Applications
Linear, reciprocating dynamic sealing applications
Operating Range
Maximum Pressure: up to 5,000psi (350bar)*. For pressure above 3,800psi (260bar), please contact engineering for clearances. Pressure ratings can be increased by reducing clearances. Sealing ultra-high pressures can be achieved by replacing the low-friction PTFE sealing element with high-strength polymer materials.
Surface Speed: up to 13ft/s (4m/s)*
Temperature: -40°F to 400°F (-40°C to 210°C) depending on material
Materials: PTFE ®, high-performance polyurethanes, low- and high-temperature grades, FDA-compliant seal material grades and proprietary specialized Duralast™, Duraloy™, and Permachem™ compounds.
