A monoflange valve including a valve body having an inlet, an outlet, and an internal bore, and a valve assembly having a valve member disposed in the internal bore for cooperating with a valve seat to open or close a flow path through the valve body. The valve seat may be disposed in the internal bore at a central region of the monoflange body proximal the inlet for enhancing fluid flow through the monoflange body. One or more valve assemblies may be provided, each having a corresponding valve seat that may be located at the central region proximal the inlet passage. One or more projections may extend radially outwardly from the valve body, and the valve assemblies may have a sealing member welded to the corresponding projection at a location spaced radially outwardly from the valve body for facilitating welding and/or inspection of the weldment.