X SECTION RING
X SECTION RING S eals that approximate to an X section are manufactured as an alternative to O-rings. The cross-section may vary from something approaching a square section with lobes, X-rings offer some potential benefits for certain applications. There are two indi-vidual sealing surfaces, so minor damage is less likely to lead to leakage. The cross-section is more resistant to spiral twisting with cyclic pressure. The mould parting line is not on the sealing surface of radial sealing applications, as it is with an O-ring. Of particular interest is that the elastomer interference is achieved by a combination of squeeze and deflection of the seal section. would be acceptable for O-rings. However, because of the more compliant cross-section the pressure range is more limited. Depending on the actual cross-sectional geometry it may be limited to pressures in the range of 8–10 bar. Although they are more resistant to rolling...