Ring Type Joint Flange is a method of ensuring leak proof flange connection at high pressures.
A metal ring is compressed into a hexagonal groove on the face of the flange to make the seal.
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Ring Joint Facings - ASME/ANSI B16.5 & B16.47-2-2
Manufacture of Pipe flanges, RTJ Flanges, Ring Type Joint Flange, Spectacle Blind Flange, ASME B16.48 Class 1500
Ring joint facing dimensions - ASME/ANSI B16.5 and B16.47 Series A (MSS SP-44) and Series B (API 605) (Continued)