Mixproof Tank Bottom Valve manufacturers Our History DONJOY built up in 1993, with registered capital RMB 105.58millions, land of 27000m2 and about 300 employees. Our Factory 27 years of R & D and manufacturing of valves and pumps 15 years of R & D and manufacturing of valve controllers More than 300 professional employees More than 200 intellectual property rights More than 30...