Gas ball valves are installed on low -pressure gas highways, both natural and liquefied gas to ensure temporary overlap of the flow. The crane handle can be made in two modifications: “butterfly” and “flag”. The advantage of gas ball cranes is that they do not require maintenance and retain the tightness of the shutter even with various contaminants of the working environment. Installed on pipes using a coupling or studio connection. Ball valves have a symmetric structure, so each end of the crane can be mounted on the input of the flow. In the design of gas ball valves, refinements-seals are used, which are made of various materials, depending on the environment in which they are operated. Such seals allow the use of a gas crane even after a long disconnection from the highway.