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Types of Valves in PipingTypes of Valves - Tables to Estimate Man-hours of AssemblyRecommended for those who are new to the subject. This publication describes the traditional valves used in piping systems. The book includes, as a supplement, tables with records of man-hours required for the assembly of threaded, flange, butt welded and wafer valves. Valves are expensive mechanical devices that control the flow and pressure within a system or process and are essential components in any piping system that carries fluidsIn this manuscript are given the fundamental characteristics of the most used valves and the man-hours necessary for their assembly.