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K33 is a single acting rod seal designed to have
inner lip shorter than the outer lip and additional sealing lip which
improves the leakage behavior and , at the same time , prevents the entry
of contaminations from the wiper side.
PRODUCT ADVANTAGES
• High wear resistance
• Superior sealing effect with the secondary lip
• Secondary sealing lip provides extra protection against the ingress of
dirt particles
• Wide range of dimensions
• Simple groove design
• Easy assembly into closed grooves
APPLICATION
Construction machinery , fork-lift trucks , injection moulding machines ,
agricultural machinery , loading platforms and standard cylinders.
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OPERATING CONDITIONS
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MEDIA
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Mineral oils (DIN 51524)
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HFA and HFB
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HFC
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TEMPERATURE
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-35°C +110°C
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+5°C +50°C
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-30°C
+40°C
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PRESSURE
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≤400 Bar
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≤400 Bar
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≤400
Bar
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SPEED
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≤0.5 m/sn
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≤0.5 m/sn
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≤0.5 m/sn
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Note:
The above data are maximum values and cannot be used at the same time.
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SURFACE
ROUGHNESS
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Ra
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Rmax
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Sliding
Surface Ød
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≤0.4 μm
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≤3.2 μm
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Groove
Base ØD
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≤1.6 μm
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≤10 μm
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Groove
Flanks B
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≤3.2 μm
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≤16 μm
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Note: It is recommended to have 50% to 90% of the
working surface material contact area value.
INSTALLATION
Easily assembled into closed grooves according to the minimum diameter
values that are given in the below table. Open grooves or special assembly
tools should be used for the values that are outside this table. It is very
important that the assembly tools must be of soft material and have no
sharp edges. Before installation the sealing element must be oiled with
system oil.
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MINUMUM
DIAMETER VALUES FOR CLOSED TYPE OF GROOVES
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(D-d)/2
(mm)
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4
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5
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6
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7.7
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10
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12.5
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15
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dmin
(mm)
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25
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30
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40
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50
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80
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100
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105
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NOTESThe permissible sealing gap values of K33 rod seal
is givenin the below table.
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PERMISSIBLE
SEALING GAP
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Smax (mm)
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t=(D-d)/2(mm)
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150 Bar
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250 Bar
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400 Bar
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t≤5
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0.30
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0.20
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0.15
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t>5
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0.35
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0.25
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0.20
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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.
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