Today s HARTMANN VALVES GmbH belongs to the leading manufacturers in the areas of ball valves pigging valves and well flanges. A worldwide presence in the crude oil natural gas petrochemical industry power plant technology as well as geothermal and other renewable energies is our reference. Construction manufacture production and tests are performed exclusively at our factories in Celle and Ehlershausen. We maintain an active dialog with our customers fulfill special requests and are known as a competent partner with our experience of many years