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The KNA44 is a single-acting seal for sealing pistons in stationary hydraulic applications and standard cylinders. The profile is designed for one-sided pressure loads and has an external main sealing lip.
The asymmetrical piston seal has a tight fit on the inside diameter. According to the data sheet, active preloading of the sealing lip makes the profile suitable for high-pressure and vacuum applications.
The sealing element of the KNA44 is made from carbon-filled PTFE. A V-spring is incorporated into the profile and functions as a preloading element.
The V-spring is made from stainless steel 1.4310 according to DIN EN 1008-1. The combination of the PTFE sealing element and metal spring forms the complete sealing construction.
The V-spring applies active preload to the sealing lip. This preload provides static tightness and supports contact between the main sealing lip and the mating surface.
Active preloading means that sealing performance is not solely dependent on the hydraulic pressure that builds up. According to the data sheet, this construction makes the KNA44 suitable for high pressure and vacuum.
The KNA44 is a single-acting piston seal and is therefore designed for pressure loads from one side. Its asymmetrical profile makes the correct installation direction important.
The external main sealing lip and preloading element must be positioned correctly in relation to the pressure side. Before installation, determine the side from which the pressure load will be applied.
According to the data sheet, the KNA44 provides low friction, including at low speeds. The seal also has no stick-slip effect.
The profile has high wear resistance and is suitable for dry running and deficient lubrication. These properties must be assessed within the other application limits for temperature, speed, pressure and medium.
The KNA44 hydraulic piston seal is intended for stationary hydraulics and standard cylinders. Its reliable design has a broad application spectrum and is suitable for moderately demanding applications in general industry.
Product advantages include high chemical resistance, low friction, high wear resistance and a wide temperature range. The profile is also suitable for dry running and deficient lubrication and provides high extrusion reliability.
According to the data sheet, the KNA44 offers a good price-performance ratio and is manufactured by certified external suppliers.
The sealing element of the KNA44 is made from carbon-filled PTFE. The V-spring is made from stainless steel 1.4310 according to DIN EN 1008-1.
During selection, both materials must be assessed in combination with the medium, temperature, pressure, sliding speed, lubrication conditions and available installation space.
The KNA44 is suitable for hydraulic oils of all types. The data sheet also specifies hot air and steam as suitable media.
The profile provides very good resistance across a wide range of media. When selecting the seal, verify the suitability of the complete material combination for the specific medium and associated operating temperature.
The KNA44 hydraulic piston seal has a temperature range of -150 to +250 °C. Its maximum sliding speed is 15 m/s and the maximum permitted pressure is 35 MPa.
These application limits are maximum values and may not all be reached at the same time. The suitability of the seal must therefore be assessed using the complete combination of temperature, pressure, sliding speed, medium, lubrication and installation conditions.
For current information about approvals and certificates, consult the material data sheet valid for the respective material. This information depends on the specific compound and cannot be listed exhaustively in the product data sheet.
The length and angle of the installation chamfers must correspond to the installation-space drawing. Correct design of the installation path is important for preventing damage to the PTFE sealing element.
The surface roughness of the groove flanks must be Ra ≤ 3 µm. The groove base must have a surface roughness of Ra ≤ 1,8 µm. A surface roughness of Ra ≤ 0,4 µm applies to the mating surface.
The KNA44 is normally installed in an axially open groove. Installation in semi-open or closed installation spaces is possible within a limited dimensional range.
Carefully clean the installation space before assembly and remove dust, dirt, metal chips and other contaminants. Do not pull the seal over sharp edges, threaded ends or cavities such as feather key grooves. Use a mounting sleeve if necessary.
The seal must not be kinked during installation. Calibrate the profile after assembly.
The KNA44 must be stored at a temperature below 25 °C. Avoid direct heat sources, direct sunlight and condensation in the storage room. Do not expose the seal to ozone or ionizing radiation.
The storage recommendations are based on the revision of ISO 2230 dated 16.09.1992. Observe all specified environmental conditions during storage.
When selecting a KNA44 hydraulic piston seal, first check the required dimensions, available installation space and direction of the one-sided pressure load. Match the installation direction of the asymmetrical profile to the pressure side and verify that the seal can be calibrated after assembly.
Then assess the temperature range of -150 to +250 °C, maximum sliding speed of 15 m/s and maximum pressure of 35 MPa. These values may not all be reached at the same time. Check the medium, lubrication conditions, surface requirements and any compound-dependent approvals as well.
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