Manometer gauge valves are a necessity in pipeline systems, since all pipeline systems that are under pressure need to be checked and maintained regularly in order to protect both the workers and the machine itself. There are several options for doing this: In pipelines that are explosive and under high pressure, electronic pressure sensors should be used. If the normal pressure is exceeded, they immediately emit electronic feedback or a warning. Within less dangerous systems, manometers can be used for optical pressure control. A manometer-gauge-valve allows you to check the pressure or exchange the pressure measuring device while the system is operating. The gauge valve sits between the pipeline and the pressure gauge. To check the pressure, the manometer gauge valve is opened. This allows you to use the manometer, in oder to read the operating pressure.