Contact seals ( GAP SEAL )

 
 

Proviscion must be made in the design of the seal for adjustment of the rings as there will be wear taking place due to the continuous contact to the shaft or piston to be sealed.

This is made possible by using overlapped or over-lapped mortise joints having a sufficiently large play at the intersegment face.

Such rings are used as choking rings for high temperature applications and high chemical requirements, furthermore  for water turbine and stern tube seals.

With segmented rings, the aforementioned adjustment can also be achieved by using unequal segments having tangential cuts and correspondingly tangential contact surfaces.

Here too it is useful to arrange the carbon sealing rings in pairs in chambers, with staggered joint

 gaps, in order to achieve a good additional axial seal.

Again the rings are pinned to one an-other or to the chamber ring, to prevent rotation.

Contact seals with such rings, however, can only be used with reciprocating motions, e.g. for the sealing of piston rods in dry running compressors.

 
 
 
 
 
 
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