Code Description D(H9) d(h9) B(-0/+0.2) a n

751

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.

INSTALLAZIONE
K751 può essere montata in sedi aperte e chiuse. E ’molto importante che gli attrezzi di montaggio siano realizzati con materiali morbidi e non abbiano bordi taglienti.
Prima dell’installazione la guarnizione deve essere lubrificata con olio di sistema.

 

MATERIAL CODE
PTFE /CARBON 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 m/s

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.

PERMISSIBLE SEALING GAP

B (mm)

S max (mm)

x

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. 

 

NOTES
Depending on the PTFE material application values and their resistance can change.

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