General Design and Gland Dimensions

Figure 30

GAP CHART

Back-up Rings are installed on the downstream side of an O-Ring to help prevent premature failure and leakage. If the sealing ring cannot resist increasingly higher pressure, part of the seal will be forced into the diametrical gap. Back-up rings are used to block the clearance gap and provide support for the seal.

Applications which fall on the right side of the curve require use of back-up rings.

Figure 31

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