In the armature, as well as in other industries, uses technical terms that reflect the specifics of this industry. To date, some of them are already widely used, others still need to be refinements and testing practices. For example, there is now the terms "conditional" and "conditional" everywhere replaced by "nominal" and "nominal." Continuous expansion of the scope of the valves causes the new terms and definitions. Pipeline valves – devices that are mounted on pipes, boilers, machines, units, tanks and other facilities intended to manage the flow of media by turning off pipelines or their parts, components, equipment, etc., the distribution of flows in the desired direction, control various environmental parameters (pressure, flow, composition, temperature, etc.), release medium to the required direction, etc. Flow control is performed by changing the cross-section of the working body fittings. Pipe and fittings divided into industrial, plumbing and laboratory.

Industrial valves fittings can be general purpose and special – for the special conditions of work. Armature is a general-purpose valves used in various areas of the economy. On functional purpose valves divided into the following classes: control valves, control valves, distribution valves, relief valves, safety valves, fazorazdelitelnaya fittings. Shut-off valve designed to block flow. It is the most widely used and number of units used is usually about 80% of all used items. To shut off valves and include a test-bleed or drain valve control that is used to test the level of fluid in the tanks, sampling, venting from the upper cavity, drainage, etc. In addition to the basic classes of pipeline valves are the following intermediates: Valves, mixing valves, pilot valves, drain. DF Gurevich, "Valves: A Reference Guide"