Hydraulic and Pneumatic Seals...since 1975
NA is a single acting pistonseal designed to have lower outside lip.
PRODUCT ADVANTAGES
APPLICATION:
Construction machinery , fork-lift trucks , injection moulding machines , agricultural machinery , loading platforms and standard cylinders
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 wiper must be oiled with system oil.
| MINUMUM 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 |
NOTES: For special applications that require high temperatures, NA can be produced in FPM, also with a anti extrusion ring in ptfe white for high pressure c.a. 250 bar. The permissible gap values of NA pistonseal is given in the below table
| PERMISSIBLE SEALING GAP Smax(mm) | |||
| t=(D-d)/2 | 50 Bar | 100 Bar | 150 Bar |
| t≤5 | 0.40 | 0.20 | 0.10 |
| t>5 | 0.45 | 0.25 | 0.15 |
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.
| MATERIAL: NBR 90 SH |
| 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 | ≤150 Bar | ≤150 Bar | ≤150 Bar |
| SPEED | ≤0.5 m/sn | ≤0.5 m/sn | ≤0.5 m/sn |
Note: The above data are maximum values and cannot be used at the same time.
| 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.
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CB = Custom build (price on request)
* = Stock item
Stock = 0 (and not a Stock* or CB product) -> minimum item value € 20.00
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