GER PU (DOUBLE ACTION PISTONSEAL PU+OR)

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GER PU is a two piece double acting sealing set which consists of a special designed polyurethane seal ring and an o-ring as energizing element.

PRODUCT ADVANTAGES

  • High static and dynamic sealing effect
  • Low axial housing heights
  • High abrasion resistance
  • Simple groove design , one-piece piston possible

APPLICATION:

Light to medium duty industrial machinery ,

INSTALLATION:

Easily assembled on one-piece piston. It is very important that the assembly tools must be of soft material and have no sharp edges. Before installation the sealing element must be oiled with system oil.

NOTES: It is recommended to use with two piston guide rings in long stroke cylinders , one guide ring in short stroke and under low radial loads. The permissible sealing gap values of GER PU piston seal is given in the below table.

PERMISSIBLE SEALING GAP   
B (mm) Smax(mm)
3.2 0.25
4.2 0.25
6.3 0.30
8.1 0.30

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. 

MATERIAL: PU 95 SH / NBR 70 SH

 

OPERATING CONDITIONS
MEDIA Mineral oils(DIN 51524)  HFA and HFB HFC
TEMPERATURE -30°C +100°C +5°C +50°C -30°C +40°C
PRESSURE ≤250 Bar ≤250 Bar ≤250 Bar
SPEED ≤0.5 m/sn ≤0.5 m/sn ≤0.5 m/sn

Note: The above data are maximum values and cannot be used at the same time.

SURFACE ROUGHNESS Ra Rmax
Sliding Surface ØD ≤0.4 μm ≤3.2 μm
Groove Base Ød ≤1.6 μm ≤6.3 μm
Groove Flanks B ≤3.2 μm ≤16 μm

Note: It is recommended to have 50% to 90% of the working surface material contact area value.

 

 

 

 

 

 

 

 

 

 

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# Vota code Name Application Material Pressure
(bar)
Temperature °C Sliding Speed (m/s)
zuiger-afdichting/ger-pu-or GER PU+OR GER PU (DOUBLE ACTION PISTONSEAL PU+OR) PISTON PU HD+NBR 500 -30°C +100 °C 0.5
PU 98SH+NBR 400 -30°C +100 °C 0.5
PU 93SH+NBR 250 -30°C +100 °C 0.5
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