General Design and Gland Dimensions
STATIC FACE or FLANGE seals are much easier to
design than static radial seals since in this type of design there
is no extrusion gap. There are fewer design steps and tolerances are
easier to control. There are two types of face seals: those designed
for internal pressure and those designed for external
INTERNAL PRESSURE design is based upon the groove OD to
limit the side movement in the groove due to pressure direction.
Figure 25 shows a diagram for a face seal designed for
Grooved OD (outside diameter Y)
This type of design is based upon groove OD to limit the side
movement of the O-Ring in the groove due to pressure direction.
Since the groove width is larger than the cross section of the
O-Ring, then the design should be made for the O-Ring to have a snug
fit on the grooved OD in order to limit O-Ring movement.
EXTERNAL PRESSURE or VACUUM design parameters are
based upon the following:
Groove I.D. (inside diameter) (x)
This design is based upon the groove I.D. to limit side movement
in the groove due to pressure direction (Fig. 26)
Due to the absence of any extrusion gap, these seal designs are
capable of withstanding very high pressures without encountering
Bolt loading or clamping force should be sufficient to prevent
any gap between mating flanges and to ensure proper squeeze.
Flanges, especially in large application, should be sufficiently
flat to prevent any extrusion gap and ensure proper squeeze.
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