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VNA (U-RING SINGLE ACTION PISTONSEAL PNEUMATIC)

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VNA  is a single acting seal that has been conceived to work on the piston and it can be used for simple or double effect. Its has asymmetrical lips which ensure a continuous contact with the bore, even in case of high misalignments. The installation is done in semi-open groove by overlapping, since the material has a high modulus of elasticity 

PRODUCT ADVANTAGES:

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

APPLICATION:

Pneumatic cylinders.

INSTALLATION:

Easy assembly into closed grooves. depending on the minimum diameter values indicated in the table below. Open grooves or special assembly tools should be used for values that are outside this table. If'm assembly tools are used the mounting area should not have any sharp edges. Before mounting the VNA  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 VNA  piston -rod seal is given in the below table.

PERMISSIBLE SEALING GAP   Smax(mm)
t=(D-d)/2 ≤20 Bar
t≤50 0.30
t>50 0.35

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 PNEUMATIC

 

OPERATING CONDITIONS 
MEDIA Prepared , Conditioned dry compressed air
TEMPERATURE -30°C + 90°C
PRESSURE ≤20 Bar
SPEED ≤1.0 m/s

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)
pneumatics-seals-piston-seal/vna-p-pneumatic VNA/P PNEUMATIC VNA (U-RING SINGLE ACTION PISTONSEAL PNEUMATIC) PISTON PU 16 -30°C +80°C 1.0
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