General Oring Design and Gland Dimensions

OSCILLATING SEALS - The inner or outer member of the assembly moves in an arc relative to the other, rotating one of the members in relation to the O-Ring. Sealing can be complicated by the fact that the O-Ring can snake or bunch in the gland. The relative motion of the moving part to the fixed part tries to carry its O-Ring contact with it, distorting the rubber circumferentially. Many oscillating seals utilize standard reciprocating design parameters or slight modifications to reduce friction.

ROTARY SEALS - Rotary seals are where an inner or outer member of the sealing assembly revolves around the shaft axis in only one direction. The direction may be reversed. Should there be multiple brief arcs of motion, the designer should refer to parameters for oscillating seals.

Figure 27

RECIPROCATING SEALS - These seals are designed much like static radial seals except for dynamic applications the squeeze is less likely to reduce friction and heat buildup. There are two types of reciprocating seals - male or piston gland design (Fig. 27) and female or rod gland design (Fig. 28).

MALE or PISTON RECIPROCATING SEALS - The design parameters for this type of seal are as follows:

Bore dimension (A)
Piston Dimension (H)
Groove Dimension (B)
Groove Width (G)

FEMALE or ROD RECIPROCATING SEALS - The design parameters include the following:

Bore dimension (e)
Rod Dimension (C)
Groove Dimension (D)
Groove Width (G)

Figure 28

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