Symmetrical Seals
Symmetrical Seals
For linear and reciprocating dynamic sealing applications
Symmetrical seals are typically centered in the gland and have sealing contact only through the seal lips; therefore,…
this seal design is less stable during cycles, creating rocking and pumping effects which in turn can create leakage and seal damage. The primary reason for the existence of symmetrical seals is its interchangeability between rod and piston applications; same seal can be used as a rod or piston seal. Further, this makes them popular for purposes of stock keeping and reduced inventory. If, however, you require the best sealing performance and durability, we recommend you select one of our non-symmetrical rod or piston seals depending on your application. These seals have very specific design features that deliver better sealing performance than symmetrical seals do
Symmetrical Seal Design Considerations:
• Symmetrical Seal Design…
• Lip vs. Squeeze Type Seals…
• Seal Lip Geometry…
Our Symmetrical Seals are classified as follows:
– High-Pressure Symmetrical Seals – up to 5000psi (350bar)*
– Ultra-High Pressure Symmetrical Seals – up to 10,000psi (700bar)*
– Long-Life Symmetrical Seals – up to 5000psi (350bar)*
High-Pressure Symmetrical Seals up to 5,000psi (350bar)*
Typical Application
Linear, reciprocating dynamic sealing applications
Operating Range
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.
Surface Speed: up to 1.6ft/s (0.5m/s)*
Temperature: -40°F to 400°F (-40°C to 200°C) depending on material
Materials: high-performance polyurethanes, NBR (Nitrile), FKM, Viton®, HNBR, EPDM, Silicone, low-temperature, PTFE, PTFE, FDA-compliant seal material grades and proprietary specialized Duralast™ , Duraloy™, and Permachem™ compounds.
