VBN is a single acting piston - rod seal (macma)  in order to be used both for rod and piston applications..

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

MONTAGE
Easily assembled into closed grooves according to the minimum diameter values that are given in the below table.  It is very important that the assembly tools must be of soft material and have no sharp edges. Before installation the VBN must be oiled with system oil.

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 VBN 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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