Code Description D(H8) d(h9) B(-0/+0.2) ds (h8) d1(±0.1) S(-0/+0.2) n

K18

K18 is a five piece double acting compact seal which consists of one elastomeric nitrile rubber sealing element , two polyester elastomer back-up rings on both sides to prevent extrusion into the sealing gap and two special profiled guide rings produced from thermoplastic to absorb transverse forces.

PRODUCT ADVANTAGES
• Superior sealing performance
• Economic sealing and guiding solution
• Simple groove design , one-piece piston possible
• Long service life
• Simple snap installation

APPLICATION
Construction machinery , fork-lift trucks , injection moulding machines , agricultural machinery , cranes and standard cylinders.

INSTALLATION
Easily assembled into one-piece piston because the back-up rings and guide rings are been produced in split forms. 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.

 

MATERIAL   CODE
NBR 80 SHORE A NB8001
TPE
  TP7301
POM   PM9901

OPERATING CONDITIONS

MEDIA

Mineral Oils
(DIN 51524)

HFA and
HFB

HFC

TEMPERATURE

-30°C
+105°C

+5°C
+60°C

-30°C
+60°C

PRESSURE

≤400 bar

≤400 bar

≤400 bar

SPEED

≤0.5 m/s

≤0.5 m/s

≤0.5 m/s

Note: The above data are maximum values and cannot be used at the same time.

SURFACE ROUGHNESS

Ra

Rmax

Sliding Surface ØD

≤0.4 μm

≤3.2 μm

Groove Base Ød

≤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.

 

NOTES
For special applications that require high temperatures , piston seal is manufactured in FKM and PTFE material.

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