VNI (U-RING SINGLE ACTION RODSEAL)

product

VNI is a single acting rod seal designed to have inner lip shorter than the outer lip

 PRODUCT ADVANTAGES

  • Superior static and dynamic sealing effect
  • Wide range of dimensions
  • Easy assembly into closed grooves
  • Simple groove design
  • Economical sealing solution

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

INSTALLATION:

Easy to assemble in a closed groove, depending on the minimum diameter values indicated in the table below. If the diameter values outside this table, we recommend an open groove. If'm assembly tools are used the mounting area should not have any sharp edges. Before mounting the VNI must be lubricated with oil system

MINUMUM DIAMETER VALUES FOR CLOSED TYPE OF GROOVES
(D-d)/2 (mm) 4 5 6 7.7 10 12.5 15
dmin (mm) 25 30 40 50 80 100 105

NOTES: the permissible sealing gap values of VNI rod seal is given in the below table.

PERMISSIBLE SEALING GAP   Smax(mm)
t=(D-d)/2 150 Bar 250 Bar 400 Bar
t≤5 0.30 0.20 0.15
t>5 0.35 0.25 0.20

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

 

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 ≤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)
hydraulic-seals-rod-seal/vni VNI VNI (U-RING SINGLE ACTION RODSEAL) ROD/AXLE PU 92SH 400 -30°C +100°C 0.5
PU 93SH 400 -35°C +100°C 0.5
PU 94 SH 400 -35°C +100°C 0.5
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