Double-acting rod seals of the types SD 02 (without notches) and SD 03 (with notches) are ideally suited for use in hydraulic systems and promise stick-slip-free running as well as good dry-running properties. The media used in these applications range from mineral oil-based hydraulic liquids, environment-friendly bio-oils and water to flame-resistant hydraulic liquids and air.
While the PTFE profile ring seals dynamically against the cylinder surface, the elastic O-ring ensures uniform contact pressure of the PTFE profile ring onto the cylinder surface and at the same time for a static sealing between profile ring and groove base.
Even with low pressures, the piston seal shows good sealing effect due to the inherent preloading of the PTFE profile ring and the contact force of the preloaded O-ring. At higher system pressures, the medium pressurizes the O-ring causing it to press the PTFE seal with enhanced force against the cylinder surface.
With different material combinations, the piston seal can be used reliably across the whole pressure, speed and temperature range.