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The K84 is a double-acting seal for sealing pistons in mobile hydraulic applications. The profile is designed for pressure loads from both sides and is intended for medium to heavy-duty applications.
The seal has a tight fit on the inside diameter. The profile ring provides sealing and preload, while the second sealing edge supports sealing performance under static and dynamic loads.
The K84 hydraulic piston seal consists of a TPU base element and a rectangular NBR ring. Within this construction, the profile ring functions as a sealing and preloading element.
The profile is symmetrical and double acting. Nubs are positioned on the end faces and the seal has a tight fit on the inside diameter. A second sealing edge forms an additional functional part of the construction.
The K84 can be subjected to pressure from both sides. This makes the piston seal suitable for hydraulic applications in which the pressure direction can alternate during operation.
The second sealing edge supports the sealing performance of the groove ring under both static and dynamic loads. The profile ring provides optimum force flow to the sealing edge.
Nubs are located on the end faces of the K84. According to the data sheet, these nubs enable rapid activation of the seal and rapid pressure build-up.
The nubs are a functional part of the profile. These elements must remain undamaged during installation so that pressure build-up and activation can take place as designed.
The K84 provides low friction and high wear resistance. According to the data sheet, the profile generates a hydrodynamic lubricant film even at low speeds.
The stick-slip effect is also minimized. These properties support consistent dynamic operation of the piston seal within the stated application limits.
The K84 hydraulic piston seal is intended for mobile hydraulics and medium to heavy-duty applications. The profile provides excellent sealing performance at low pressure and good static and dynamic sealing.
Other stated advantages include low friction, high wear resistance, rapid pressure build-up and high extrusion reliability. The profile ring provides optimum force flow to the sealing edge.
The data sheet describes the K84 as a proprietary design with a broad range of applications across different industries and requirements. Quality, durability, safety and favourable total cost of ownership are also listed as product characteristics.
The base element of the K84 is made from TPU. The rectangular ring within the sealing construction is made from NBR.
During selection, both materials must be assessed in combination with the medium, temperature, pressure, sliding speed and conditions within the installation space.
The K84 is suitable for hydraulic oils according to DIN 51524 part 1-3 and for lubricating oils. The piston seal can also be used with lubricating greases based on mineral oils.
The specified media also include the flame-retardant hydraulic fluids HFA, HFB and HFC according to VCMA 24317. When selecting the seal, verify that the medium is suitable for both the TPU base element and the rectangular NBR ring.
The K84 hydraulic piston seal has a temperature range of -30 to +100 °C. Its maximum sliding speed is 0,5 m/s and the maximum permitted pressure is 40 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 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 cylinder housing and piston must be chamfered to prevent damage to the seal. The length and angle of these installation chamfers must correspond to the installation-space drawing.
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 ≤ 0,3 µm applies to the mating surface.
The K84 must be installed in a closed, cut groove. Deburr sharp edges and provide them with seamless chamfers and radii. 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 during installation. Use a mounting sleeve if necessary to protect the profile during assembly.
Heating the seal in oil to 80 °C makes the sealing material more elastic and simplifies installation. Grease the piston seal before fitting the cylinder.
The marking on the profile ring can be used to check that the seal has not accidentally been twisted during installation.
The K84 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 K84 hydraulic piston seal, first check the required dimensions, available installation space and double-acting pressure load. Also verify that the closed groove is suitable for installing the complete sealing construction.
Then assess the temperature range of -30 to +100 °C, maximum sliding speed of 0,5 m/s and maximum pressure of 40 MPa. These values may not all be reached at the same time. Check the medium, surface requirements, installation conditions and any compound-dependent approvals as well.
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