![Kolbenschieber mit AUMA-Kegelradgetriebe DN 50 Class 300 Typ GKV 446 Bild von Kolbenschieber mit AUMA-Kegelradgetriebe DN 50 Class 300 Typ GKV 446](https://www.gaebler-armaturen.de/wp-content/uploads/1_asme300dn50.jpg)
Motor- and Gearbox Valves
If the valves are installed behind a concrete protection wall an operation with bevel gearbox or, for smaller valves with simple stem extension can be the solution.
As an alternative, if a slow opening and closing is required, the automatic operation can be performed with electric motor drive.
Especially for long-distance pipelines with valves distant from the control centre this is quite a common solution.