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PS-72 (PU)

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  1. Zwolle 252 items
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  1. Piston Seal PU Type: PS-72
    Dimensions: 100 x 80 x 11 x 10
    Part number: 29860
    In Stock
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  2. Piston Seal PU Type: PS-72
    Dimensions: 100 x 80 x 13 x 12
    Part number: 23215
    In Stock
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  3. Piston Seal PU Type: PS-72
    Dimensions: 100 x 80 x 14.5 x 13.5
    Part number: 23271
    In Stock
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  4. Piston Seal PU Type: PS-72
    Dimensions: 100 x 80 x 16 x 15
    Part number: 73378
    In Stock
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  5. Piston Seal PU Type: PS-72
    Dimensions: 100 x 85 x 10 x 9
    Part number: 73379
    In Stock
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  6. Piston Seal PU Type: PS-72
    Dimensions: 100 x 85 x 12.5 x 11.4
    Part number: 73380
    In Stock
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353 items

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PS-72


Description

The PS-72 is a single acting piston seal designed to have outer lip shorter than the inner lip in order to be used for piston applications. The standard materials of the PS-72 are NBR and Polyurethane.


Product advantages

  • superior static and dynamic sealing effect
  • wide range of dimensions
  • easy assembly into closed grooves
  • simple groove design
  • economical sealing solution


Applications

  • construction machinery
  • injection moulding machines
  • fork-lift trucks
  • agricultural machinery
  • loading platforms
  • standard cylinders


Operating conditions

Media Mineral oils (DIN 51524) HFA and HFB HFC
NBR PU NBR PU NBR PU
Temperature (min.) °C -30 -30 +5 +5 -30 -30
Temperature (max.) °C +105 +100 +60 +50 +60 +40
Pressure Bar ≤150 ≤400 ≤150 ≤400 ≤150 ≤400
Speed m/sec  ≤0,5  ≤0,5  ≤0,5  ≤0,5  ≤0,5  ≤0,5


Drawing PS-72

tol. groove dimensions:
d (f7)/dp (h11) 
Db (H11)/D (H11)
B (-0/+0.2)


Installation

Easily assembled into closed grooves according to the minimum diameter values that are given in the below table. Open grooves or special assembly tools should be used for the values that are outside this table. It is very important that the assembly tools must be of soft material and have no sharp edges. Before installation the seal must be oiled with system oil.


Surface roughness  Ra Rmax
Sliding Surface ØD-Ød ≤0.4 μm ≤3.2 μm
Groove Base ØDb-Ødp ≤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.


Minimum diameter values for closed type of grooves

(D-d)/2 (mm.) 4 5 6 7,7 10 12,5 15
dmin (mm.) 25 30 40 50 80 100 105


Sealing gap

permissible sealing gap NBR NBR NBR PU PU PU
t=(D-d)/2 (Bar) 50 100 150 150 250 400
t≤5 0,40 0,20 0,10 0,30 0,20 0,15
t>5  0,45 0,25 0,15 0,35 0,25 0,20

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.


Turned seals

We can also produce this piston seal on request in the materials below. This is our type DK101.

Materials Colour min. temp. ºC max. temp. ºC max. speed m/s max. pressure Mpa Sizes
Polyurethane 95° Shore A red -20 115 0,4 400 5 - 500 mm 
NBR 85° Shore A black -30 110 0,5 160 5 - 500 mm 
EPDM 85°  Shore A black -45 130 0,5 160 5 - 225 mm 
FKM 85° Shore A black -20 220 0,5 160 5 - 200 mm 
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