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Drainage valves are used in highways conducting fluid flows, linking the working environment with the atmosphere. When the pressure in the system reaches the set level, the tap is opened, and the liquid is slow. The drainage crane is used in systems when the release of large volumes of liquid, for example, in sprinkling and watering systems for conservation by winter. Drainage valves are also installed in pipelines laid in rooms where a sharp change in temperature is possible, and the formation, as a result, condensate. Using drainage valves, the condensate is removed from the pipes, and certain sections of the pipeline are ventilated. The valves are installed at points where the pipe slope is 3 mm per linear meter.