7 years ago


Distributor's Link Magazine Summer Issue 2012 / VOL 35 / NO.3


78 THE DISTRIBUTOR’S LINK WAVE SPRINGS COST EFFECTIVE MEANS OF SEALING FLUIDS IN MECHANICAL SEALS by Henry Yates, Technical Sales Engineer Mechanical seals are used for the sealing of rotating shafts against stationary housings, as in pumps, multiport swivels and agitators. The assembly of a mechanical seal is based on two main components: one “rotating” part and one “stationary” part. The “rotating" part of the seal is usually fixed on a shaft or hub; the “stationary" part of the seal is located at a static housing. The sliding faces, which are part of the inner life of the seal, rotate axially in opposition and are pressed against each other. The necessary spring force preventing the seal from leaking when the apparatus is idle is provided by flatwire wave springs. The shaft is sealed by secondary sealing elements like O- rings and the seal faces are statically sealed against the housing. The introduction of the pumped medium into the minimal sealing gap generates a lubricating film resulting in the desired sealing effect. Flatwire wave springs are used in all types of mechanical seals for a variety of industries to seal fluids, which could pass between a static and a rotating element. One advantage from a manufacturing standpoint is that Rotor Clip Company Inc. 187 Davidson Avenue, Somerset, NJ 08873 Tel: 1-800-557-6867 Fax: 732-469-7898 Email: only one spring is generally needed per assembly. Some assemblies require multiple springs, which can lead to errors should a line worker forget to add one or more of these springs to an assembly. Wave springs “foolproof” the assembly process and minimize complaints and breakdowns in the field. Using wave springs also eliminates the need to drill additional holes into the periphery of the seal housing needed to provide enough axial space for coil springs; they will also save radial space compared to coil springs with bigger diameters, resulting in overall cost savings. Other advantages to using wave springs for mechanical seals include: • No torsional movements compared to a coil spring during the compression to work height; a wave spring always provides its load in axial direction. • A very low spring rate with an extremely flat load deflection curve could be specified by using a multiple turn wave spring to increase the life of a mechanical seal dramatically; the slide ring, which will wear down during operation, is preloaded with the same force for a longer time. please turn to page 165


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