Ball valves with discharge, in contrast to classic "ball valves" in threaded or flanged design, have an additional drain valve on the valve side. Drain ball valves therefore serve the same way as a regular ball valve to turn off the flow, but it is also possible fot the circuit to be drained.
Ball valves with discharge differs from the conventional in the threaded or flanged design by having an additional discharge valve on the side. Like the conventional ball valve, the valves with discharge serve to close the pipeline. The side drain screw then allows the circuit to be drained. This feature is often used to drain garden water before winter. The ball valves with discharge can also be motorized with Belimo actuators. More than 26 years with you!