VNI LF (U-RING SINGLE ACTION RODSEAL LOW FRICTION)

product

VNI LF is a single acting rod seal, which is designed to ensure low friction force, reliable backpumping ability and superior sealing.

 PRODUCT ADVANTAGES

  • Superior static and dynamic sealing effect
  • Low friction capability
  • Increased extrusion resistance
  • Reliable backpumping ability
  • Operates well with a doublewiper without a problem

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 LF 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

Note: the permissible sealing gap values of VNI LF 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 94 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)
stang-afdichting/vni-lf VNI LF VNI LF (U-RING SINGLE ACTION RODSEAL LOW FRICTION) ROD/AXLE PU 9401 FRICTION REDUCED 400 -35°C +100°C 0.5
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