Dictionary

Valve (Chapter 4) is a device, which is installed on a pipeline or vessel and designed for opening or closing under certain conditions (increase of pressure inside the tank, change the direction of flow of the medium inside the pipeline). Valves have a large number of designs. Valves can be single-seat and double seat, the latter are usually used only as distribution and regulating ones. Depending on the direction of flow through the valve, the valves are divided into pass-through, process and angular. In press-through valves, the working medium at the outlet of the housing has the same direction as at the inlet. Process valves are checkpoints with a straight flow line. They have lower hydraulic resistance if compared to through-holes. In angle valves, the direction of flow of the medium at the outlet is perpendicular to the direction of flow at the inlet.