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Custom radial seal rings

04 April 2012

Metallized Carbon Corporation has introduced custom radial seal ring assemblies (or packing rings), which are used to prevent leakage from industrial blowers, pumps and other turbo machinery by sealing the clearance between a rotating or reciprocating shaft and the stationary housing. These seal rings are available in more than 150 grades of proprietary carbon/graphite material, and Metcar will work with customers to select the optimum grade for a specific application.

Metcar’s packing rings are suitable for sealing both liquid and gases in aircraft turbine engines, blenders and mixers, furnace exhaust blowers, and oil free piston compressors, as well as ship propeller shafts, steam turbines, and water pumps and turbines. The carbon-graphite radial seal assemblies help solve serious leakage problems that occur when stuffing box seals fail due to wear, thermal degradation, chemical attack, and dimensional stability problems.

Two types of radial seal rings are available. The 'close clearance' version is a one piece, solid ring made to fit with close clearance on the outer dimension of the rotating or reciprocating shaft. If the shaft is expected to experience thermal expansion, the carbon-graphite ring comes in a version that is shrink-fitted into a metal retaining ring, providing the carbon graphite/metal assembly the same thermal expansion rate as the shaft.


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