TESCO GSM WITH LOCK (DOUBLE ACTION PISTONSEAL)

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TESCO GSM is a two-piece double-acting piston seal consisting of a thermoplastic sealing element with a slot, and an elastomeric ring for the pre-tension.

 

PRODUCT ADVANTAGES

  • Excellent sealing performance under static and dynamic applications
  • Simple groove design
  • Easy fit without installation tool
  • Superior sealing performance at high and variable pressure levels
  • Longer service life due to high abrasion resistance
  • Excellent sealing at high surface roughness
  • Outstanding resistance to pressure shocks
APPLICATION
Heavy duty cylinders and construction machinery.

 

INSTALLATION
Easy assembly with a piston in one piece. Sealing elements must be pre-assembling system rubbed with oil

NOTES: It is recommended to use with minimum two piston guide rings (DWR/EDWR) in long-stroke cylinders , minimum one guide ring (DWR/EDWR)  in short stroke and under low radial loads

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

PERMISSIBLE SEALING GAP   Smax (mm)
B (mm) 800 Bar
4.2 0.35
6.3 0.50
8.1 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

MATERIAL: PA / NBR 80 SH

 

OPERATING CONDITIONS 
MEDIA Mineral oils(DIN 51524)  HFA and HFB HFC
TEMPERATURE -30°C +105°C +5°C +60°C -30°C +60°C
PRESSURE ≤800 Bar ≤800 Bar ≤800 Bar
SPEED ≤1.0 m/sn ≤1.0 m/sn ≤1.0 m/sn

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

SURFACE ROUGHNESS Ra Rmax
Sliding Surface ØD-Ød ≤0.4 μm ≤4 μm
Groove Base ØDb-Ødp ≤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/tesco-gsm-m-slot-nbr-or TESCO GSM M/SLOT NBR/OR TESCO GSM WITH LOCK (DOUBLE ACTION PISTONSEAL) PISTON GSM-NBR 800 -30°C +105°C 1.0
GSM-FPM 600 -20°C +200°C 1.0
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