Flange Types

Flat Face

• Mating faces of both flanges are flat
• Gasket may be ring type, or full face, which covers the entire face both inside and outside the bolts

Raised Face

• Mating face is flat, but the area inside the bolt holes is raised 1/16" or 1/4"
• Gasket is usually ring type, entirely within bolts
• langes may be disassembled easily without springing the flange

Ring Joint

• Both flange faces have matching flat-bottomed grooves with sides tapered from the vertical at 23º
• Gasket seats on flat section of flange between bore and ring joint groove
• Garlock spiral wound gaskets can replace solid metal ring gaskets
  

Male-Female

• Depth of female (recessed) face normally equal to or less than height of male (raised) face, to prevent metal-to-metal contact during gasket compression
• Recessed O.D. normally is not more than 1/16" larger than the O.D. of the male face
• Joint must be pried apart for disassembly

Tongue and Groove

• Groove depth is equal to or less than tongue height
• Groove usually not over 1/16" wider than tongue
• Gasket dimensions will match tongue dimensions
• Joint must be pried apart for disassembly
  

Groove to Flat

• One flange face is flat, the other is recessed
• For applications requiring accurate control of gasket compression
• Only resilient gaskets are recommended —spiral wound, hollow metal O-ring, pressure-actuated, and metal-jacketed gaskets