SMI (SINGLE ACTION RODSEAL)

product

SMI is a three piece single acting sealing set which consists of one reinforced cotton fabric or thermoplastic elastomer back-up ring , one specially designed multiple lipped elastomeric nitrile rubber sealing element and one thermoplastic anti-extrusion ring.

PRODUCT ADVANTAGES

  • Functions even with poor surfaces
  • Effective sealing during vibration and shock loading
  • Improved sealing gap due to the active anti-extrusion ring
  • Superior sealing effect in high pressures
  • Improved sealing gap due to the active back-up ring
  • Alternative design to packings (chevron)

APPLICATION:

Earth moving equipment , excavators , cranes , loading platforms , and special machinery.

INSTALLATION:
 
Installation for open slots. For installing in a closed groove, the support ring should be in an angle of 75 ° are doorgesnijden. It is important that the assembly tool has to be soft material, and no sharp edges. Must be oiled with system oil for the installation of all the individual parts of the seal.

NOTES: For special applications that require high temperatures , our seal set is being manufactured in the following configuration , FPM header ring , back-up ring and anti-extrustion rings from special mixture of PTFE material.

PERMISSIBLE SEALING GAP   Smax(mm)
t=(D-d)/2 150 Bar 250 Bar 400 Bar 700 Bar
  0.40 0.20 0.10 0.075

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: NBR 80 SH / TPE / POM

 

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 ≤700 Bar ≤700 Bar ≤700 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-Ød ≤0.2 μm ≤2.0 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)
stang-afdichting/smi SMI SMI (SINGLE ACTION RODSEAL) ROD/AXLE NBR-TPE-POM 700 -30°C +105°C 0.5
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