Technical renovation was made on the chemical do sing, coagulation settling, and filtration system of Xinjiang Shidunzishan Wate r Works, with the emphasis on the renovation of siphon filter, in which the bac k air-water washing, closure backwashing, and flap valve for draining were ado pted.

Path of instantaneous center of hydro-automatic flap gate and its influences on gate s stability;

The tail-water adjustment with recumbent flap gate has properties of fast response and wide adjustment,which is a common method of controlling tail-water in an unsteady hydraulic model.

The design background,technical specialty and structure of portal turn plate idler roller are introduced,and the roller working fundamentals in normal belt running,gliding and braking conditions.

The special hydraulic valve taking the place of the stopper for gas pipe has improved the efficiency,decreased the intensity and danger in the operation of gas.