(pack) Rod Sealing U-ring K33 PU/NBR/POM ID 42mm-50mm (choose dimensions)

Description

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.
MATERIAL
CODE
PU
94 SHORE A
PU
9401
OPERATING CONDITIONS
MEDIA
Mineral oils (DIN 51524)
HFA and HFB
HFC
TEMPERATURE
-35°C +110°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
≤0.4 μm
≤3.2 μm
Groove Base ØD
≤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.
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.
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 K33 rod seal is givenin the below table.
PERMISSIBLE SEALING GAP
Smax (mm)
t=(D-d)/2(mm)
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.