K704

K704 - Rod Seal
   KASTAŞ NO d(f8) D(H8) B(+0.2/-0.0) r
 K704-140 140 160 10 0,4
 K704-155 155 175 10 0.4
 K704-200 200 220 10 0,4
 K704-240 240 265 12,5 0,4
 K704-280 280 305 12.5 0.4
 K704-290 290 315 12,5 0,4
 K704-300 300 325 12.5 0.4
 K704-310 310 340 15 0,8
 K704-320 320 350 15 0,8
 K704-330 330 360 15 0.8
 K704-340 340 370 15 0,8
 K704-380 380 410 15 0,8
 K704-415 415 445 15 0.8
 K704-475 475 505 15 0.8
 K704-560 560 584 17,5 1,2
 K704-570 570 605 17.5 1.2

K704 is two piece single acting rod seal which consists of one special mixture PTFE profile ring and a NBR elastomer ring as energizing element.


PRODUCT ADVANTAGES
•Low friction , free of stick-slip
•Long service life
•High sliding speed
•Wide range of temperature and chemicals depending on the energizing material
•Minimum static and dynamic friction coefficient for minimum energy loss
•Simple groove design and low axial housing heights

APPLICATION
Steel industry , injection moulding machines , presses , large diameter cylinders
MATERIAL   CODE
PTFE   PT6003
NBR 80 SHORE A NB8001
OPERATION CONDITIONS
MEDIA Mineral oils (DIN 51524) 
TEMPERATURE -30°C +105°C
PRESSURE ≤400 Bar
SPEED ≤5.0 m/sec
Note: The above data are maximum values and cannot be used at the same time.

    

 
SURFACE ROUGHNESS Ra Rmax
Sliding Surface Ød ≤0.2 μm ≤2.0μm
Groove Base ØD ≤1.6 μm ≤6.3μm
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
We recommend using assemly tool (See section; Hydraulic Sealing Elements General Installation Information). 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.
 

NOTES
For HFA HFB HFC used applications , special filled PTFE materials are recommended. Resistance in low temperature and high temperature applications can be improved by alternate elastomer compounds.
 
PERMISSIBLE SEALING GAP
B (mm)  Smax (mm)
x   150 Bar  250 Bar  400 Bar
10 0.60 0.50  0.40
12 , 5  0.65 0.55  0.45
15 0.70 0.60  0.50
17 , 5  0.75 0.65  0.55
20  0.80 0.70  0.55

Note: All the above mentioned "S" values are maximum and it's vital to use lower values for the system security.