A single-acting, O-ring energized rod seal with hydrostatic pressure relief channel for dynamic applications. Prevents pressure trap between seals under all service conditions. Installed in closed grooves including grooves to ISO 7425, Turcon® Stepseal® V offers high sealing efficiency. It also gives, low friction with no stick-slip, minimal break out force and high wear resistance. Turcon® Stepseal® V is preferably used together with a secondary seal from the range of Turcon® and Zurcon® rod seals, together with a double-acting Excluder® or Scraper.


Stepseal®V is based on the dynamic, unidirectional Turcon®Stepseal®sealing concept. During the extending stroke of the rod, the contact force on the sealing edge creates high local sealing pressure and limits the formation of fluid film under the seal. When the rod is retracted, the Stepseal®sealing face supports hydrodynamic back-pumping of the fluid film, and ensures leak-free sealing efficiency with low friction and long service life.


In long-stroke cylinders and equipment operating with low speed during retraction, it has been found that hydrodynamic  back-pumping may become insufficient to prevent build-up of pressure in the seal system behind the primary seal. Pressure build-up in the seal system leads to leakage, increased friction and wear, and may ultimately require replacement of the seals.


The usual precaution in such equipment has been to provide space for a buffer volume behind the primary seal or to install a drain line. First invented by Trelleborg Sealing Solutions, the built-in check valve function eliminates pressure build-up and so render buffer volumes and drain lines obsolete.


Stepseal®V has the efficient seal performance and outstanding service life of the Turcon®Stepseal®range and the reliable prevention of pressure build-up brought by a refined check valve function. Stepseal®V is available in high-grade Turcon®or Zurcon®materials with outstanding sliding and wear resistance properties.



Pressure: up to 50 MPa (Turcon®M12) up to 60 MPa (Turcon®T08 and Zurcon®Z53

Speed: up to 15 m/s with linear movements, frequency up to 15 Hz

Temperature: -45 °C to +200 °C  depending on seal and o-ring material

Media: Mineral oil based hydraulic fluids, flame retardant hydraulic fluids, environmentally friendly hydraulic fluids (bio-oils), phosphate ester, water and others, depending on the seal and o-ring material.

Clearance: The maximum permissible radial clearance Smax is shown in Table 16, as a function of the operating pressure and functional diameter.



  • Check valve function of O-ring eliminates risk of fluid bypassing the seal during pressure loading when pressurized
  • No pressure build-up on secondary sealing element and excluder®
  • Independent of any speed relation of counter surface
  • Independent of stroke length
  • High tolerance to hardware non-concentricity and radial play
  • Minimum contribution of friction of secondary sealing element and/or excluder®
  • Minimum wear of secondary sealing element and/or excluder®
  • Increased leakage control
  • Prolonged seal life
  • Increased operational reliability
  • Fits standard Stepseal®2K groove dimensions as well as ISO 7425 seal housings