Piston U-ring

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TECHNICAL DATA

U-RingProfileMaterialHardnessBarsTemperatureSpeed
PistonCollarín para pistónTPU92 SH A≤400-35 °C to +110 °C≤0,50 m/s

Quick LINKS

Piston U-rings

Piston U-Rings have a higher inner lip than the outer lip and are generally used in single-acting applications. Their asymetrical lips design provides a continuous contact with the bore. Their special relief grooves and extrusion resistance thanks to the back-up ring ensure high performance and long service life.

ADVANTAGES

  • Superior static and dynamic sealing effect
  • Simple groove design
  • Easy assembly into closed grooves
  • Dynamic pressure relief grooves
  • Very good wear resistance

APPLICATIONS

Heavy-duty cylinders, scrap cutters, hydraulic jacks.

WORKING CONDITIONS

TPU92 

MEDIA 

Mineral oils (DIN 51524) 

HFA & 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 

 

ROUGHNESS SURFACE

  

Ra 

Rmax 

Dynamic surface

≤0,4 μm 

≤3,2 μm 

Groove base

≤1,6 μm 

≤10,0 μm 

Groove flanks

≤3,2 μm 

≤16,0 μm 

INSTALLATION

Easily assembled into closed grooves. 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.

Maximum permissible gap TPU

Pressure (Bares) 

S Max (mm) 

100 

1,00 

150 

0,80 

250 

0,70 

400 

0,60 

Note: 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

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