K751

K751 - Spring Loaded Piston Seal
   KASTAŞ NO D (H9) d (h9) B (-0/+0,2) amin. n
 K751-006 6 3.1 2.4 0.4 1.8
 K751-010 10 7,1 2,4 0,4 1,8
 K751-020 20 15,5 3,6 0,6 2,8
 K751-025 25 18.8 4.8 0.7 3.8
 K751-030 30 23,8 4,8 0,7 3,8
 K751-040 40 33,8 4,8 0,7 3,8
 K751-050 50 40,6 7,1 0,8 5,6
 K751-060 60 50,6 7,1 0,8 5,6
 K751-063 63 53,6 7,1 0,8 5,6
 K751-070 70 60,6 7,1 0,8 5,6
 K751-075 75 65.6 7.1 0.8 5.6
 K751-080 80 70,6 7,1 0,8 5,6
 K751-085 85 75,6 7,1 0,8 5,6
 K751-090 90 80,6 7,1 0,8 5,6
 K751-100 100 90,6 7,1 0,8 5,6
 K751-110 110 100,6 7,1 0,8 5,6
 K751-115 124.4 115 7.1 0.8 5.6
 K751-120 120 110,6 7,1 0,8 5,6
 K751-125 125 112.8 9.5 0.8 7.6
 K751-130 130 117,8 9,5 0,8 7,6
 K751-140 140 127,8 9,5 0,8 7,6
 K751-150 150 137,8 9,5 0,8 7,6
 K751-160 160 147,8 9,5 0,8 7,6
 K751-170 170 157,8 9,5 0,8 7,6
 K751-200 200 187.8 9.5 0.8 7.6

K751 is a two piece single acting piston seal which consists of a PTFE u-ring with metal spring as a tension component.

PRODUCT ADVANTAGES
• Superior static and dynamic sealing effect by the metal spring
• High resistance to chemicals and temperature changes
• Low friction , free of stick-slip
• High sliding speed
• Long service life
• Good dry running conditions
• Can be sterilized
• Low static and dynamic friction values

APPLICATION
Hydraulic and pneumatic cylinders , hot water valves , pumps , hot steam vanes , food processing , chemical and medical technology.
MATERIAL CODE
PTFE PT6002
STAINLESS STEEL SPRING CN9902
OPERATING CONDITIONS
MEDIA Hydraulic oils , hot air , water , steam , all media that do not react PTFE and stainless steel
TEMPERATURE -150°C +250°C
PRESSURE ≤350 Bar
SPEED ≤15.0 m/sn
Note: The above data are maximum values and cannot be used at the same time.

    

SURFACE ROUGHNESS Ra Rmax
Sliding Surface Ød ≤0.2  μm ≤2.0 μm
Groove Base ØD ≤1.6 μm ≤6.3 μm
Groove Flanks B ≤3.2 μm ≤15 μm
Note: It is recommended to have 50% to 90% of the working surface material contact area value. If the operating media is gas we recommend having Ra value not to be above 0.15 μm.

INSTALLATION
K751 is to be assembly into open and closed grooves. 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
Depending on the PTFE material application values and their resistance can change. The permissible sealing gap values of K751 spring loaded piston seal is given in the below table.
 
PERMISSIBLE SEALING GAP
   B (mm) Smax (mm)
  50 Bar 150 Bar 250 Bar 350 Bar
2.4-3.6 0.10 0.075 0.05 0.05
4.8 0.20  0.10 0.075 0.06
7.1 0.25 0.15 0.10 0.075
9.5 0.30  0.15 0.13 0.075
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.