Opening Angle and Impact Force Analysis of Different Types Flap Valve in Pumping Stations

Abstract

Based on the energy method, the motion equation of the flap valve is deduced. Combining with the example of Bailizhou Pumping Station, the opening angle and impact force of the flap valve with different forms of installation (free rollover, free suspended, covers), different valve pages ( single-leaf and double-leaf ) and different materials ( steel and composite materials ) are analyzed and calculated. Under the same conditions, the results show that: for single-block flap valve of different installations, opening angle of free rollover flap valve is bigger than free suspended flap valve at 22°, and bigger than cover flap valve at 12°, impact force of three installation forms flap valve is close. For different valve pages, opening angle of double-leaf flap valve is slightly larger than the single-leaf, impact force of free rollover double-leaf flap valve is 42% of the single-leaf, and cover double-leaf flap valve is 49% of the single-leaf. Comparing different materials, opening angle of free rollover composite flap valve is 4% bigger than the steel flap valve, its impact force is 9.6% smaller than steel flap valve, and opening angle of free suspended composite flap valve and cover composite flap valve is 10%∼15% bigger than their steel flap valve, impact force of free suspended composite flap valve is 39.5% smaller than the steel flap valve, and cover composite flap valve is 28.5% smaller than the steel flap valve.