Code Description D(H8) d(h11) B(-0/+0.2) d1 n

K40

K40 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.

 

MATERIAL   CODE
PU 94 SHORE A PU9401
POM   PM9901

OPERATING CONDITIONS

MEDIA

Mineral Oils
(DIN 51524)

HFA and
HFB

HFC

TEMPERATURE

-30°C
+100°C

+5°C
+50°C

-30°C
+40°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.

PERMISSIBLE SEALING GAP

PRESSURE (bar)

S max (mm)

100

1.0

150

0.8

250

0.7

400

0.6

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. 

 

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