Developer's DescriptionBy ESBE ABThe ESBE app is an excellent tool for plumbers, installers, system designers to find out which ESBE valve to choose and what Kvs value to use.The ESBE app is an excellent tool for plumbers, installers, system designers to find out which ESBE valve to choose and what Kvs value to use. There is also additional technical information about the different valve series as well as contact information to ESBE.