RX gaskets are designed for pressures up to 5,000 PSI. These gaskets are manufactured in accordance to API 6A and ASME B16.20，and they interchangeable with R-oval or R-octagonal rings used on API 6B flanges. The RX is a pressure energized version of the R octagonal gasket and fits the R type flat bottomed groove. The RX has an increased height and utilises the internal system pressure to energise and improve the seal as internal pressure increases. Some RX sizes have a pressure relief hole to equalize pressure both sides of the sealing faces.
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