Description Flat Face Flange Simple Flange In this type of flange, the surface of the two flanges that must be placed in front of each other is smooth and holes have been created around it to install two simple flanges together. Cast iron or steel flanges that are used at low pressures are usually made of this type. Flat Face Flange is very simple to use and its low pressures are used for lines running with polyethylene pipes. To connect valves. And cast iron fittings and non-steel flanges of pumps, simple steel or cast iron flange is used. For more information, call 09339765265 Call 09123261608.