Page 20 - HydraulicSealsCatalog

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U-Cup Installation Data
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The lips of the U-Cup should always be toward the pressure force.
The U-CUp is a floating seal wich means the height of the U-Cup
should be between .015” to .090” shorter than the depth of the
gland. (See the Packing Space Chart below). The added gland
space allows the pressure to equalize on both lips, thus keeping
the U-Cup from rolling.
The surface finish for a static seal surface should be 32 RMS maxi-
mum. The dynamic surface should be in the range of 8 to 16
RMS. Finishes rougher than 16 RMS could cause prematuer lip
wear and finishes finer than 8 RMS can result in failure of the seal
due to loss of lubrication.
Packing Space Chart
Seal Depth 1/8 3/16 1/4 5/16 3/8 1/2 5/8 3/4
Packing .137 .206 .274 .342 .411 .548 .685 .822
Space .142 .212 .281 .351 .421 .560 .700 .839
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