PS-72 (PU)
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- Piston Seal PU Type: PS-72
Dimensions: 100 x 80 x 13 x 12Part number: 6543601Delivery time: ± 8 weeksMore Details - Piston Seal PU Type: PS-72
Dimensions: 100 x 80 x 14.5 x 13.5Part number: 23271In StockMore Details -
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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 |
| 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 |
