Trelleborg releases unique rotary seal for extended service life
Trelleborg Sealing Solutions launches a unique rotary seal with “outstanding performance and reliability” when running at greater speeds and higher temperatures.
The innovative Turcon® Roto Glyd Ring® V is a premium double-acting rotary seal, which is primarily intended for double-acting pressure applications within severe working conditions that require extended rotary service. The seal, specifically engineered for machinery where a high Pressure-Velocity (PV) value is required, allows equipment to run at the highest possible speeds in extreme pressures allowing for an extended service life.
Henrik Vollmond, Product Manager for the seal, says: “Customers are demanding increased performance from rotary seals that challenge the PV values of current seals. We therefore needed to develop a rotary seal that can run at higher speeds combined with higher pressures.
“This resulted in the development of the unique Turcon® Roto Glyd Ring® V, which not only achieves these requirements but also, by virtue of lower heat generation, offers a significantly extended seal life. For the equipment operator that means lower overall costs due to reduced maintenance requirements and energy consumption.”
Rigorous tests have been carried out on the pioneering product and show that it runs with low frictional torque at all pressures from 0.5 MPa and above with low sensitivity to pressure increases from 0.5 to 20 MPa. It achieved a PV twice as high as other bidirectional seals and demonstrated 50 per cent lower friction. Furthermore, wear of the seal and O-Ring was so small that it could not be measured.
Like other O-Ring activated Slipper Seals, the initial squeeze of the O-Ring ensures sufficient contact pressure between seal and mating surface to provide tightness at low pressure. With increasing system pressure, the O-Ring transmits increasing forces through the seal body to increase the contact force on the sealing surface to ensure sealing efficiency at all pressures.
Uniquely, the Turcon® Roto Glyd Ring® V has a built-in valve function. Valve ports connect both sides of the Turcon® ring profile to the space in the center, which is the lubricating groove. An elastomer ring is installed in the lubricating groove to prevent static leakage through the ports.
When Turcon® Roto Glyd Ring® V is pressurized from one or the other side, the elastomer ring opens the port on the pressure side and equalizes the pressure beneath the elastomer ring – pressure balancing the seal by more than half. Shifting pressurization through the ports also renews the fluid in the space between the “legs”, improving lubrication under the seal.
The innovative sealing solution is ideal for use within equipment when a long service life is required within demanding service conditions. Typical examples are within rotary connections with full rotation or swivel movements, such as hydraulic swivels, lead-throughs and hydraulic rotators.
With maximum recommended operating temperatures of +100 °C/ +212 °F (up to +150°C/ +302°F at lower PV-values), Turcon® Roto Glyd Ring® V is designed to fit into standard Roto Glyd Ring® grooves. It is available in four cross section series; for shafts in diameters from 35 to 500 millimeters/ 1.377 to 19.685 inches and for bores from 22 to 500 millimeters / 0.866 to 19.685 inches.
When specifying Turcon® Roto Glyd Ring® V, users should note the following. Pressure should be limited to a maximum of 30 MPa. Velocity needs to be limited to 2.0 meters per second. The Roto Glyd Ring® V has been successfully tested up to a combined PV of 10 MPa.m/s.Location: