Yinhe Hu has worked in the valve testing industries since 1980s  after graduation from school , with the influence of his father Liying Hu,( The main founder & designer of Valve test bench in Yongjia Hydraulic station department), Throughout his career , he is focused in valve testing & inspection equipments developing , from the manufacturing, designing, engineering, product management , sales and marketing, all of those positions he gained more than 20 years experiences, in 2009 He built his own Valve test bench factory (Dory Machinery) in Yongjia,Wenzhou,China, Dory machinery specialize in testing equipments for industrial valves and pumps for the chemical, pharmaceutical, oil and gas and any other domestic and overseas application where valves to be used.

Kerui Zhu ,Engineer of Dory Machinery since established, he has been providing technical supports as well as working as a door to door training and commissioning services for the valve test equipments and valve grinding machines. He is well rounded and skilled for any aspect of the test machine design, he was one of the former staff for Yongjia Hydraulic station factory in 1980S.