In the conventional sense Pipeline name of the device for controlling media flow through the pipeline shutdown, or parts thereof, the dismemberment of the media on the desired direction, correction of various environmental parameters. Let us analyze one type of pipe fittings – valves, which are divided into the following types: 1. Valves (Check Valves) Valve (valve shut) – this is a constructive view of Pipeline, the which is to stop the flow of the working environment of closure moves back and forth along the axis) the sealing surface of the body. The mobile host shutoff valve is a stem, screw-in thread fixed nut, located in the lid, or yoke. Using a thread running, which is self-braking, lets leave the closure device in any intermediate position without inadvertent movement under pressure. By design of the hull shut-off valves are) continuous, corner and through-flow. By type spindle seal globe valves are divided into stuffing and bellows.
2. Check valves lifting Check valve is automatically activated version of the safety elements that are designed to eliminate the reverse flow of the working environment in a pipe at a pressure drop below a certain value. Lifting check valves have a closure, the traffic back and forth perpendicular to the direction of travel of the working environment in the valve. Check valves lifting, which have the guard at the entrance and which designed for installation at the beginning of the receiving pipe, said suction valves reversed. 3. Safety Valves Safety valves is a variant of valves, which is designed to automatic protection of technological systems and pipelines from the off-design overpressure protection by means of a partial discharge of the protected equipment.