Seals protect exhaust gas recirculating valves
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Trelleborg Sealing Solutions UK product story
Edited by the Engineeringtalk editorial team
Dec 28, 2006
Although useful in preventing NOx emissions, EGR valves run into problems when diesel fuel builds up carbon deposits.
Busak + Shamban offers three solutions for sealing in EGR (exhaust gas recirculating) valves used in diesel engines.
Although useful in preventing NOx emissions, EGR valves run into problems when diesel fuel builds up carbon deposits.
Exhaust gases can form a sticky gum or even hard deposits which often cause premature seal or bearing failure.
Busak + Shamban offers Double Delta seals, Glyd Ring II seals and Variseals to combat these problems.
A Double Delta seal, consisting of a PTFE component which rides on the shaft and is energised by an O-ring, can be used to improve valve performance by creating a balance between the desired leakage, friction and response time of the valve.
To reduce tolerances and allow greater flexibility in electronic program controls, a Glyd Ring II, in which the elastomer is bonded to the PTFE, is available to control tolerance stack up and performance variation.
For the most demanding applications, a Variseal, in which the elastomer is replaced with a slant coil spring to energise the seal, is available to make sealing function and friction more consistent, especially in near gas-tight and high temperature applications.
"The drive for cleaner and more fuel-efficient engines should lead to an increase in the usage of diesel engines in the future".
"As a company, Busak+Shamban is at the forefront of this EGR valve sealing technology, and is uniquely positioned to offer our customers the most cost effective solutions to meet their application needs".
"This technology is truly exciting, as we move forward with the push for greater environmental awareness", said Jerome Zawada, Electromechanical Segment Manager for Busak + Shamban.
Previously, unburned diesel gases remaining in cylinders were vented via exhaust systems into the atmosphere.
Early pollution devices developed to diminish the problem limited excessive hydrocarbons and carbon dioxide, but tended to induce the formation of oxides of nitrogen (NOx), which led to the formation of smog.
Busak + Shamban worked closely with valve manufacturers to develop EGR valves to reduce NOx emissions.
EGR valves can run on vacuum pressure or mechanically, but recently the electronically controlled version has become more popular.
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