K98

K98 - Piston Rod Seal
   KASTAŞ NO d(f7) dp(h11) Db(H11) D(H11) B (-0/+0,2) n
 K98-019 19,05 25,4 6,98 3
 K98-022 22,23 28,58 3,51 3
 K98-025 25,4 31,75 6,98 3
 K98-025/1 25,4 34,93 5,28 4
 K98-025/2 25,4 34,93 8,71 4
 K98-025/3 25,4 38,1 6,98 4,5
 K98-031 31,75 38,1 6,98 3
 K98-031/1 31,75 41,28 8,71 4
 K98-038 38,1 47,63 8,71 4
 K98-038/1 38,1 47,63 10,49 4
 K98-038/2 38,1 50,8 10,49 4,5
 K98-044 44,45 53,98 10,49 4
 K98-050 50,8 60,33 10,49 4
 K98-050/1 50,8 63,5 10,49 4,5
 K98-057 57,15 69,85 6,98 4,5
 K98-063 63,5 76,2 10,49 4,5
 K98-076 76,2 88,9 10,49 4,5
 K98-088 88,9 101,6 10,49 4,5
 K98-092 92,08 101,6 10,49 4

K98 is a single acting piston - rod seal and designed to have symmetrical lips in order to be used both for rod and pistonapplications. O-ring acts as a spring and provides sealing contact under low pressures and shock pressures.

PRODUCT ADVANTAGES
• Good sealing performance under low pressures and shock pressures
• Superior static and dynamic sealing effect
• Easy assembly into closed grooves
• Simple groove design
• Economical sealing solution

APPLICATION
Fork-lift trucks , injection moulding machines , agricultural machinery and standard cylinders.
MATERIAL CODE
NBR 70 SHORE A NB7001
PU  92 SHORE A PU9201
OPERATING CONDITIONS
   PU
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.
 

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 wiper 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 K98 piston -rod seal is given in the below table.
PERMISSIBLE SEALING GAP
   PU 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.