Seal system balances pressures
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Trelleborg Sealing Solutions UK product story
Edited by the Engineeringtalk editorial team
Nov 16, 2007
The Turcon Stepseal V design has a stabilising edge which prevents seal deformation and increases assembly robustness by protecting the seal face during rod insertion.
Trelleborg Sealing Solutions' Turcon Stepseal V prevents the pressure buildup that can occur with some tandem seal arrangements used in hydraulic cylinders.
It prevents pressure being trapped in the most difficult of arrangements.
In hydraulic cylinders the requirements for sealing are varied and difficult.
The applications are dynamic, often operating at high speeds and significant pressures.
A single seal is rarely a good enough and in most cases, a configuration of seals is required.
Typically, to optimise sealing integrity a cylinder will include between three and five different dynamic seal and scraper types, some in tandem arrangement.
Though configurations that use Turcon Stepseal are usually effective, in some designs, pressure can still build up between two seals.
Turcon Stepseal V incorporates a hydrostatic pressure relief system, which provides rapid pressure actuation and pressure balancing under all service conditions.
A machined valve groove ensures precise opening and closing of the relief channel, providing robust performance of the relief function independent of hardware deflection.
The inherent friction characteristics, wear and abrasion resistance of Turcon are enhanced with Stepseal V's contoured rear chamfer for hydrodynamic back-pumping.
In back-pumping technology, on the forward stroke of the shaft, an oil lubricating film is distributed under the seal.
On the return stroke, the oil is back-pumped into the system, preventing leakage, reducing dynamic friction and breakaway force, even after extended periods of rest.
Performing over a temperature range from -45C to +200C, Turcon Stepseal V is suitable in both static and dynamic situations.
It operates at speeds up to 15m/s, with reciprocating movements and frequencies up to 5Hz in pressures up to 800bar.
With excellent compatibility to media including many commonly encountered hydraulic fluids such as those based on mineral oil, flame-retardant compounds, environmentally safe fluids (bio-oils) and water.
In addition, the design and function of the seal means no buffer volume is required, saving both cost and space.
The Turcon Stepseal V design has a stabilising edge which prevents seal deformation and increases assembly robustness by protecting the seal face during rod insertion.
It can be fitted in bore diameters up to 2700mm and rod diameters up to 2600mm.
With very good extrusion resistance, it suits wide hardware clearances.
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