MHA Zentgraf was founded in 1945 by Alfred Zentgraf as a mechanical engineering company. Since 1978 we have been producing hi ... gh pressure ball valves and control valves and are today one of Europe’s leading manufacturers. MHA is today leader in his field of activity. Our products are used in many fields of application all over the world. Our product development and manufacturing are characterised by consistent cost orientation and quality without compromises. read more