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What is an O ring?

An O-ring is a circular cross-section ring molded from rubber (Figure 1-1). The gland — usually cut into metal or another rigid material — contains and supports the O-ring (Figures 1-2 and 1-3). The combination of these two elements; O-ring and gland — constitute the classic O-ring seal assembly. Groove Bore Piston Rod

How do you install an O-ring?

Install the first o-ring by pushing it over the cone-shapedportion of the nipple. The first o-ring assembly is completewhen the o-ring “snaps” into the groove nearest the point ofassembly. The second o-ring will slide over the first o-ringand will fit into the second groove.

What are the characteristics of a squeezed O ring?

1. The cross section of a squeezed O-ring is rectangular. 2. The cross section area of a squeezed O-ring is the same as its area in the free condition. 3. The permeability rate of a gas through an O-ring is pro- portional to the pressure differential across the seal. For convenience, the formula contains mixed units.

How do you design a rotary O-ring seal?

Attention to clearances, side thrust, and end-play are critical in designing effective rotary O-ring seals. Whenever it can be avoided, an O-ring should not be installed in a gland that holds it in more than a minimum of tensional stress. This principle is especially important to consider when designing for an O-ring rotary shaft seal.