The plates used to cover and close the ends of pipes are known as Blind Flange. All of the necessary boltholes are there, however there is no centre hole.
READ MORECompanion flange, also referred as a hub, allows a flange yoke to be connected to another form of connection for adequate torque transfer.
READ MORELong Weld Neck Flange, also known as LWN Flange, are comparable to conventional Welding Neck Flange, but the "Neck" is much longer.
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