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Guide rings and bands serve to prevent any contact of the piston and/or rod with the cylinder wall in order to avoid subsequent damage to these parts. Usually, guides with straight or scarf joints are used. The scarf joint is the most commonly used joint.
Types
Straight Joint |
Scarf Joint |
Continous |
Shouldered with straight joint |
Guide rings with straight or scarf joints can only be fitted if no more than 1/3 of the guide ring width overruns the valve nests inside the cylinder. If several valve nests are overrun, one-piece shrink-fitted guide rings are used. Depending on the respective application, piston guide rings with axial and/or radial balancing grooves may be used as well. The dimensions of the guide ring depend on the particular application
Operating Limits
Sliding speeds ≤ 4 m/s
Temperature range -100 °C to +200 °C
Specific pressure load at 20 °C max. 10.0 N/mm2
at 100 °C max. 5.0 N/mm2
at 180 °C max. 2.5 N/mm2 |
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