... on-off operatior.-Minimized operating torque , energy saving .-Flow curve in straight line , Excellent regulation performance .-Long working life , 30,000 ... and outside of China .Besides, we always make delivery on time , All in all , our aim is to be your most reliable ... .Tianshun Valve guarantees that all the products will keep in good repair in 1 year, During the guarantee period , we will take ...