TESCO (DOUBLE ACTION PISTONSEAL) (PU+NBR) (TB+NBR)

product

TESCO PU is a two piece double acting sealing set which consists of a special design polyurethane seal ring and a NBR elastomer ring as energizer.

 

PRODUCT ADVANTAGES

  • Superior static and dynamic sealing
  • Ability to move without vibration even at low running speeds
  • No twisting in the house due to rectangular profile
  • Standardized housing according to ISO 7425-1
  • Easy installation
  • Low axial housing heights

APPLICATION:

Construction machinery, agricultural machinery, Injection molding machines, general industrial applications

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 choosing suitable material and quantity for guiding element regarding the purpose of application

NOTES: the permissible sealing gap values of TESCO piston  seal is given in the below table.

PERMISSIBLE SEALING GAP   Smax (mm)    
B (mm) 150 Bar 250 Bar 400 Bar
3.2 0.30 0.20  
4.2 0.40 0.30  
6.3 0.50 0.40 0.25
8.1 0.60 0.50 0.35

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 80 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 ≤4 μm
Groove Base Ød ≤1.6 μm ≤10 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/tesco-uitw TESCO UITW TESCO (DOUBLE ACTION PISTONSEAL) (PU+NBR) (TB+NBR) PISTON PTFE-BRONS-NBR 400 -30°C +105°C 5.0
PTFE/BRONZE FPM 400 -20°C +200°C 5.0
PTFE-GLAS-FPM 400 -20°C +200°C 5.0
PU 98SH+NBR 400 -30°C +100°C 0.8
PU 93SH+NBR 250 -30°C +100 °C 0.5
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