a) Raised Face, commonly known as RF;
b) Ring Joint, commonly known as RTJ, Ring To Joint.
There are 2 type of RF:
a) 2 mm Raised Face,
b) 7 mm Raised Face.
2 mm Raised Face is used on flanges of valves with pressure rating of 150LB and 300LB.
7 mm Raised Face is used on flanges of valvs with pressure rating of 400LB, 600LB, 900LB, 1500LB and 2500LB.
For RTJ flanges, it is important to know the Groove Number (also known as R Number, or Ring Number). So we know what-size Ring to use for the RTJ groove.
A good standard to read about RF flange dimensions and RTJ flange dimensions is ASME B16.5 - Pipe Flanges and Flange Fittings.
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