This example starts out to chose the right seal for a known flange.
For the sake of the example an O-ring made out of Stainless Steel 321 without a heat treatment, with 50 µm silver plating is required.
The groove diameter (DG) of the flange below is 100,00 mm. The groove depth is 2,60 mm.
Assuming an excess pressure on the inside the choice will be made for an OVI-seal.
For an internal pressure seal the diameter of the seal is the outside diameter. To determine the right diameter for the seal the following formula is followed:
OD = DG – DC – 2 x maximum plating thickness
The diametrical clearance depends on the chosen axial section of the seal. In this case the groove depth of 2,60 mm corresponds to the groove depth of a seal with an axial section of 3,18 mm, for the sake of the example the M version of the section is chosen. The diametrical clearance for a seal with this axial section is 0,25 mm.
As said earlier in this example the maximum plating thickness will be 50 µm.
This gives us:
100,00 mm – 0,25 mm – 2x (50 µm) = 99,65 mm
All that is needed to complete the product code is the information that was already stated in the beginning of this example.
- The code that corresponds with the Stainless Steel 321 is “3”.
- The O-seal does not contain a spring, hence the spring code is “0”.
- The absence of a heat treatment gives the code “1” for the heat treatment.
- And the plating code for a seal with 50 µm of silver is “S50”.
This give the following product code for this particular setup:
- For C(S)A seals the seal diameter is always the outside diameter of the seal. This is calculated based on the bore diameter.
- Plating thickness on radial seals should be limited to 50 µm. Seal diameters remain unchanged for plated seals
- For COI seals the diameter is always the shaft diameter without plating.
DSI = SD
- For COE seals the diameter is always the bore diameter without plating.
DSO = BD