| A flap vlave used in pumping station is a kind of hydraulic-operated automatic gate, which is similar to a hinged check vaive. Because of their simple structure and reliability, being able to shorten the length of outlet passage and facilitate the starting of pumping system in comparison with siphonic vacuum-distroied cutoff scheme. So it is propitious to be used and save investment But at the same time, flap valves always show some disadvantage. One side, groovy cast steel flap valves increase the head loss, waste electricity, the other side, when flap valves close, it always delay time because of it's low proportion. The bump load seriously threaten the safety of pumping station.Through the research and development of flap valve used in the renovation practices in the design of air-filled floating flap valve in NO.1 Chuhe Pumping Station of Anhui province, the working characteristics and design methods of air-filled floating flap valve are studied in this paper. Based on the research and model test, the head loss of flap valves is analyzed by both mathematical physics method and the equation of criterion, and the impulsive force and open angle of flap valve are researched. The flap valve approximate-calculation method is the emphases in this paper. The design methods and using effect of air-filled floating flap valve are studied in the paper by combining with engineering example. The open angle, head loss and hydrodynamic pressure under the rated flow and several kinds of proportion are carefully observed in the model test,and these results are given for reference in engineering design.A program for the design and calculation of flap valve is developed in this paper. Data transfer is realized by utilizing the interfaces both between VisualBasic and Excel and between VisualBasic and AutoCAD, so the graphs can be generated and the data saved automatically to decrease the repeated work and improve the work efficiency.
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