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U-Ring | Profile | Material | Hardness | Bars | Temperature | Speed |
Rod U-Ring | PU/TPU | 92-93 SH A | ≤150 | -35 to +110 ºC | ≤0,50 m/s |
Rod U-Rings have an inner lip that is smaller than the outer lip and are typically used in single acting applications. Unlike standard rod U-rings design, this shape also has a lip on the inner face, which greatly improves sealing by reducing the thickness of the oil film and preventing contaminants from entering the system. Almost total guarantee that no dirt and/or air enters the system.
The design involves preloading of the seal body, which allows for easy absorption of stem deflections and excellent sealing due to lip compression during installation. During operation, system pressure is added to the radial mechanical contact forces. JIOrings offers a range of 750 standard sizes.
Construction machinery, fork-lift trucks, injection moulding machines, agricultural machinery, loading platforms and standard cylinders.
TPU92 / TPU95 | |||
Media | Mineral oils (DIN 51524) | HFA and HFB | HFC |
Temperature | -40 °C to +105 °C | +5 °C to +50 °C | -30 °C to +40 °C |
Pressure | ≤400 Bar | ≤400 Bar | ≤400 Bar |
Speed | ≤0.5 m/sn | ≤0.5 m/sn | ≤0.5 m/sn |
TPU95 High performance | |||
Media | Mineral oils (DIN 51524) | HFA and HFB | HFC |
Temperature | -35 °C to +110 °C | +10 °C to +50 °C | -35 °C to +50 °C |
Pressure | ≤400 Bar | ≤400 Bar | ≤400 Bar |
Speed | ≤0,5 m/sn | ≤0,5 m/sn | ≤0,5 m/sn |
Note: For special applications requiring high temperatures, U-rings can be manufactured in FPM.
Roughness surface | ||
| Ra | Rmax |
Dynamic surface | ≤0,3 μm | ≤3,0 μm |
Groove base | ≤1,6 μm | ≤10,0 μm |
Groove flanks | ≤3,2 μm | ≤16,0 μm |
Easily assembled into closed grooves according to the minimum diameter values that are given in the below table. Open grooves or special assembly tools should be used for the values that are outside this table. It is very important that the assembly tools must be of soft material and have no sharp edges. Before installation the wiper must be oiled with system oil.
Minimum diametre values for closed type of grooves | |||||||
(D-d)/2 (mm) | 4 | 5 | 6 | 7,7 | 10 | 12,5 | 15 |
D min (mm) | 25 | 30 | 40 | 50 | 80 | 100 | 105 |
Maximum permissible gap PU/TPU | |||
C/S | Pressure (Bar) | ||
150 | 250 | 400 | |
≤5 | 0,30 | 0,20 | 0,15 |
>5 | 0,35 | 0,25 | 0,20 |
Nota: The largest sealing gap value occurring on the non-pressurized side of the seal does have a vital importance for the function of the seal and in this respect it is quite important to use the S value lower than the above indicated numbers.