Types of Flange face
With flange Face the form and implementation of the side of a flens are meant, where a sealing ring or
gasket will be placed. The most used types are:
1. Raised Face (RF)
2. Flat Face (FF)
3. Ring-Type Joint (RTJ)
4. Male-and-Female (M&F)
5. Tongue-and-Groove (T&G)
• RAISED FACE (RF)
The Raised Face type are the most applied flange type, and is easily to identify. It is referred to as a raised
face because the gasket surfaces are raised above the bolting circle face.
• FLAT FACE (FF)
The flat face (full face) flange has a gasket surface in the same plane as the bolting circle face. Applications
using flat face flanges are frequently those in which the mating flange or flanged fitting is made from a
casting.
• RING-TYPE JOINT (RTJ)
RTJ flanges have grooves cut into their faces which steel ring gaskets. The flanges seal when tightened
bolts compress the gasket between the flanges into the grooves, deforming (or Coining) the gasket to make
intimate contact inside the grooves, creating a metal to metal seal.
• MALE-AND-FEMALE (M&F)
With this type the flanges must be matched. One flange face has an area that extends beyond the normal
flange face (Male). The other flange or mating flange has a matching depression (Female) machined into it′s
face.
• TONGUE-AND-GROOVE (T&G)
With this type the flanges also must be matched. One flange face has a raised ring (Tongue) machined onto
the flange face while the mating flange has a matching depression (Groove) machined into it′s face.
These facings are commonly found on pump covers and valve bonnets.
Jangsu Votti has been exporting various of pipe fitting & flanges for many years.
