BUFFERSEAL (U-RING SINGLE ACTION RODSEAL)

product

BUFFERSEAL is a two piece single acting seal which consists of one special designed elastomeric sealing element for to evacuatethe back pressure and one thermoplastic back-up ring.

PRODUCT ADVANTAGES:

  • No pressure build up between the primary and secondary seal
  • High wear resistance
  • Low friction
  • Improved sealing gap due to the active back-up ring
  • Low axial housing heights
  • Good protection to the secondary seal with pressure peaks

APPLICATION:

Construction machinery , fork-lift trucks , injection moulding machines , agricultural machinery , loading platforms and standard cylinders

INSTALLATION:

Easy to install in closed grooves. If'm assembly tools are used the mounting area should not have any sharp edges. Before mounting the BUFFER SEAL must be lubricated with oil system.

NOTES: BUFFERSEAL is always used in a sealing system in combination with groove seal (VNI, VNI-L, etc), these are not intended as a main sealing element. BUFFERSEAL reduces the pressure peaks in itself and what is important, it protects the main seal against pressure fluctuations. The values of the allowable sealing gap of the buffer seal can be found in the table below.

 

PERMISSIBLE SEALING GAP       Smax(mm)
t=(D-d)/2 150 Bar 250 Bar 400 Bar
4.2 0.40 0.30 0.20
6.3 0.60 0.50 0.40

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 92 SH / POM

 

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 ≤400 Bar ≤400 Bar ≤400 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 ≤0.4 μm ≤3.2 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/bufferseal BUFFERSEAL BUFFERSEAL (U-RING SINGLE ACTION RODSEAL) ROD/AXLE PU-POM 400 -35°C +100°C 0.8
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