BNI (SINGLE ACTION BALSELE)

product

BNI is a two piece single acting rod seal which consists of areinforced cotton fabric and nitrile rubber vulcanized togetherforming an integral sealing element and one thermoplastic back-up ring.

PRODUCT ADVANTAGES:

  • Functions even with poor surfaces
  • Reinforced cotton fabric base prevents the seal from extrusion
  • Easy assembly into closed grooves
  • Improved sealing gap due to the active back-up ring
  • Good sealing at low pressures

APPLICATION:

Mining equipment , after market , mobile hydraulics , presses andstandard cylinders..

INSTALLATION:

BNI is used in open grooves., Also with dense grooves but then the assembly is difficult. If'm assembly tools are used the mounting area should not have any sharp edges. Before mounting the BNI must be lubricated with oil system.

The permissible sealing gap values of BNI  rod seal is given in the below table. BNI can be produced in FABRIC/FPM with ptfe bu ring  for special applications that require high temperatures..

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

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 / NBR FABRIC

 

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 ≤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 ≤1.8 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/bni BNI BNI (SINGLE ACTION BALSELE) ROD/AXLE FABRIC-NBR-POM 400 -30°C +105°C 0.5
FABRIC-VITON-PTFE 400 -30°C +175°C 0.5
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