The VN seal type combines in one solution two different installations and applications.
With two symmetrical lips, it can be used both for rod and piston sealing applications and for cylinders working with simple or double effect.

PRODUCT ADVANTAGES

• The profile with equal lips and the deep groove ensures low friction and a linear movement even at low pressure.
• ​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 VN 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 VN piston -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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