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For preventing metal-to-metal contact between piston and cylinder during sliding (particularly in case of lateral forces), PTFE piston ring is simple assembly and wear-resistant. Thanks for its good media resistance, the piston ring can be used in several media ranging from mineral oil-based hydraulic liquids, environment-friendly hydraulic liquids and water-oil emulsions to flame-resistant hydraulic liquids and dry-running applications. Piston guide rings offer very good gliding behavior, good emergency running properties and also a high wear resistance. Additionally, they help to attenuate mechanical vibrations.
Main Features
Outstanding dry-running characteristics
Different joint types available for optimal performance
Exceptionally low friction coefficient in combination with metals and plastics
Chemically resistant to almost all solid, liquid and gaseous media
Easy installation of sealing and guide rings to one-piece pistons
Typical Applications
Compressors operating under full and low-tube conditions
Gas rotary pumps
Liquid gas and vacuum pumps
Rotation compressors for loading/unloading of tanks
Generation of oil-free compressed air
Material Selection
| Material | Characterstics |
| Virgin PTFE | Piston rings are used in cases that require very high chemical resistance and generally in low velocity and low pressure applications. But Virgin PTFE is too soft and has a very high coefficient of thermal expansion. |
| PTFE + carbon | Piston rings are most commonly used. They have very high resistance to wear and deformation under load and perfect wear resistance in dry and wet environments. They do not wear off the surface in contact even at high velocities. They have very high heat conductivity. Compared to types with other fillers, their resistance to alkalies is better, but their resistance to oxidizers is less than glass-filled. |
| PTFE + glass | Piston rings are recommended where chemical resistance is important. Their resistance is low only against alkalies. They can wear off surface in contact at high PV values if surface in contact is not hard enough. Compared to virgin PTFE piston rings, they have higher wear resistance and deformation resistance under load. |
| PTFE + polyimide | Excellent in dry service with low wear rate in vacuum and inert gases. Very low abrasion to dynamic mating surfaces. It's suitable for high speed rotating applications. But the price are most expensive. |
| PTFE + bronze | Piston rings have highest heat conductivity, but their chemical resistance is not good. Generally speaking chemical environments that affect bronze have an effect also on bronze-filled PTFE. Their resistance to deformation and wear under load is good. They can be used at low and high PV values where chemical resistance is not necessary. If surface in contact is not too hard, they are also appropriate at high speeds in dry conditions |
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