Zurcon U-Cup RU2. Single Acting U-Cup Asymmetric, Double Lip, Compact Material: Zurcon
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1 Single Acting U-Cup Asymmetric, Double Lip, Compact Material: Zurcon 121
2 122
3 U-Cup RU2 Description Today U-Cups are used primarily as seals for piston rods in hydraulic cylinders. U-Cups in polyurethane are proven elements, due to their good mechanical properties, for standard cylinder construction, particularly for mobile hydraulics under rough operating conditions. The U-Cup RU2 is a double lip seal in a compact design. Type RU2 The compact U-Cup type RU2 is designed for small grooves. It is thus particularly suitable for use in space-saving designs. The compact form provides a high sealing effect even with low system pressures. The U-Cup has two sealing lips in the dynamic sealing zone. The compact form with two sealing lips provides an improvement in the leakage behaviour at low system pressures. Due to the incorporation of an oil trap between the two sealing lips, friction at pressures above approx. 10 MPa is reduced. Furthermore, the second sealing lip prevents the entry of dirt from the atmosphere side. Advantages - Good sealing effect at high and low pressures - Good abrasion resistance, wear-resistant - Unaffected by sudden loads - Suitable for small grooves - Simple installation. Technical Data Operating pressure: Speed: Temperature: Media: Max. 40 MPa Up to 0.5 m/s Use in mineral oils: -35 C to C Mineral oil-based hydraulic fluids. Important Note: The above data are maximum values and cannot be used at the same time. e.g. the maximum operating speed depends on material type, pressure, temperature and gap value. Temperature range also dependent on medium. Material p Standard Zurcon : Z20 Special Polyurethane: 93 Shore A Colour: turquoise Seal clearance Figure 44 U-Cup, type RU2 Method of Operation The sealing effect of the U-Cup comes from the intrinsic preload of the seal body and from the compression of the seal lips during installation. In operating condition, the radial mechanical contact forces are superimposed by the system pressure. At low stroke speeds, U-Cups can tend to have a stick-slip effect due to an inadequate lubrication film formation in the seal clearance and to their material properties. This behaviour corresponds to the Stribeck curve described in the relevant literature. Guide values for the radial clearance between rod and gland in relation to the operating pressure and rod diameter can be found in the table below. Operating max. Pressure MPa Radial Clearance S max. d N <60 mm d N >60mm The values for S max. given in this table apply to all types for the low-pressure side of the U-Cup. They are designed for an operating temperature of 60 C. 123
4 D1 Zurcon U-Cup RU2 Installation Recommendation r max. 0.3 L S d N B Figure 45 Installation drawing Dimensions "S" (see table on previous page) Ordering example U-Cup Type RU2 Rod diameter: d N = 45.0 mm diameter: D1 = 55.0 mm width: L = 11.0 mm TSS Part No.: RU Material TSS Article No. RU22 TSS Series No. Type (Standard) Rod diameter x 10 Quality Index (Standard) Z20 Standard Zurcon : Special polyurethane: Colour: Z20 93 Shore A turquoise Material code Table XXXII Installation dimensions / TSS Part No. Note Rod Seal d N f8/h9 D 1 H10 L +0.2 B Dimensions printed in bold type correspond to ISO/DIN 5597 and ISO 5597/1. Split groove Additional dimensions can be delivered on request. TSS Part No. RU RU RU RU RU RU RU RU RU
5 Note Rod Seal d N f8/h9 D 1 H10 L +0.2 B Dimensions printed in bold type correspond to ISO/DIN 5597 and ISO 5597/1. Additional dimensions can be delivered on request Split groove TSS Part No. RU RU RU RU RU RU RU RU RU RU RU RU RU RU RU RU RU RU RU RU RU RU RU RU RU RU
6 126
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