K 40 is a two piece single acting piston seal which consists of asymmetrical profile with pressure relieving grooves and a thermoplastic back-up ring.

PRODUCT ADVANTAGES

  •  Superior static and dynamic sealing effect

  • Improved sealing gap due to the active back-up ring

  • Relief grooves against dynamic pressure

  • Easy assembly into the closed groove

  • Simple groove design

  • Highly wear resistant

APPLICATION

Heavy duty cylinders, scrap cutters and hydraulic jacks.

INSTALLATION

Easily assembled into one piece piston. It is very important that the assembly tools must be of soft material and have no sharp edges. Before installation all individual parts of the seal must be oiled with system oil.

NOTES

The permissible sealing gap values of K 40 piston seal is given in the below table.

MaterialCode
PU 94 SHORE APU9401
POMPM9901
Surface roughnessRaRmax
Sliding Surface Ød≤0.4 μm≤3.2 μm
Groove Base ØD≤1.6 μm≤10 μm
Groove Flanks≤4.0 μm≤16 μm

PERMISSIBLE SEALING GAP

Pressure (Bar)Smax (mm)
1001.0
1500.8
2500.7
4000.6

OPERATING CONTITIONS

MediaMineral oils (DIN 51524)HFA HFBHFC
Temperature-30 °C
+100 °C		+5 °C
+50 °C		-30 °C
+40 °C
Pressure≤400 bar≤400 bar≤400 bar
Speed≤0.5 m/sec≤0.5 m/sec≤0.5 m/sec

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