K755

K755 - Piston Seal
   KASTAŞ NO D(H8) d(h8) B(+0.2/-0.0) r n
 K755-200-175 200 175 12,5 0,4 10
 K755-220-195 220 195 12.5 0.4 10
 K755-225-200 225 200 12.5 0.4 10
 K755-240-215 240 215 12.5 0.4 12
 K755-250-220 250 220 15 0.8 12
 K755-260-230 260 230 15 0.8 12
 K755-320-290 320 290 15 0.8 12
 K755-325-295 325 295 15 0,8 12
 K755-327.5-297.5 327.5 297.5 15 0.8 12
 K755-340-310 340 310 15 0.8 12
 K755-350-320 350 320 14 0.8 12
 K755-355-325 355 325 15 0,8 12
 K755-360-330 360 330 15 0.8 12
 K755-430-400 430 400 15 0.8 12
 K755-460-430 460 430 14 1.2 12
 K755-490-460 490 460 15 1.2 12
 K755-540-505 540 505 17.5 1.20 12
 K755-590-555 590 555 17.5 1.2 12

K755 is a two piecedouble acting piston seal which consists of one energizing elastomer ring and special mixture thermoplastic ring.

PRODUCT ADVANTAGES

•Low firction , free stick-slip
•Excellent performance in large diameter cylinders and heavy duty applications
•Long service life
•High sliding speed
•Wide range of temperature and chemicals depending on the o-ring material
•Minimum static and dynamic friction coefficient for a minimum energy loss
•Simple groove design and low axial housing heights
•No twisting in the housing

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

    

 
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 special assembly 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 special applications that require high temperatures , rod seal is manufactured in FKM and PTFE material.
 
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 0.60

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