Walker and, United Kingdom
Walker and, United Kingdom

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Warren P.,James Walker and Co Ltd | Winterbottom S.,James Walker and Co Ltd | Douglas A.,James Walker and Co Ltd
Sealing Technology | Year: 2012

This article describes a simple method for evaluating extrusion resistance, and studies fluorocarbon and hydrogenated nitrile rubber compounds at different temperatures and extrusion gaps. It also considers any correlation between standard laboratory test data and failure conditions. Having benchmarked those elastomers which use "conventional" compounding technology, modifications are made to improve their performance using a number of techniques. Finally, an assessment of the maximum extrusion resistance that may be expected from an elastomer at elevated temperatures, while maintaining a balance of elastomeric properties, concludes this article. © 2012 Elsevier Ltd.


Matzakou M.-A.,James Walker and Co Ltd. | Bowman P.,James Walker and Co Ltd.
BHR Group - 22nd International Conference on Fluid Sealing 2013 | Year: 2013

An investigation of the contact band width characteristics of radial lip seals (Walkerseles) under various running conditions is performed. In order to do the latter, an existing test rig (0160mm shaft Rig) has been modified to incorporate a stainless steel hollow shaft with a 7mm thickness hardened glass section as the running surface. Pressures up to 1.3bar were tested. Three different seal designs are compared. Media temperature, pressure and shaft torque will be monitored at regular intervals using embedded sensors. Observation of the running pattern of the seal, as well as dimensional assessment of the contact band width will be looked into using a high definition, high frequency camera. Data acquisition and subsequent analysis arc performed using computer software. The seal to shaft contact area at start up will be examined. In addition, building up to different shaft rotational speeds up to 5m/s, will be trialled in order to assess changes in the seal lip contact area. The peaks in the torque/time curve, corresponding to static and dynamic friction, based upon the torque measurements obtained, will also be examined. In addition, a correlation of the latter features' location on the curve with the observed behaviour of the seal will be discussed. The effect of different lengths of spring on torque and subsequently on the contact band width of the seal will be identified. © BHR Group 2013.


Smith T.,United Road Services | Ashbridge M.,James Walker and Co Ltd | Thornton K.,James Walker and Co Ltd
Sealing Technology | Year: 2013

This two-part article describes the technical advances that have resulted from both field and test-rig trials of James Walker's HydroSele, and how captured data are being used to push the performance envelope of this sealing system to enable it to cope with the most demanding run-of-river and pump-storage applications. It also highlights what the firm believes are the key issues with main shaft seal designs-both radial and axial-and how HydroSele is able to overcome them. The first instalment, which appears here, covers the sealing principle, early testing and results, problems and difficulties encountered, and material development. The second part, which will be published in our March issue, will contain two brief, customer case-studies. © 2013 Elsevier B.V. All rights reserved.


Smith T.,United Road Services | Ashbridge M.,James Walker and Co Ltd | Thornton K.,James Walker and Co Ltd
Sealing Technology | Year: 2013

This two-part article describes the technical advances that have resulted from both field and test-rig trials of James Walker's HydroSele, and how captured data are being used to push the performance envelope of this sealing system to enable it to cope with the most demanding run-of-river and pump-storage applications. It also highlights what the firm believes are the key issues with main shaft seal designs-both radial and axial-and how HydroSele is able to overcome them. © 2013 Elsevier Ltd.

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