PURPOSE: To improve the actual head of a discharge pipe by amplifying the pressure difference of a terminal conduit of a resonance vibrating pipe utilizing the vertical or horizontal movement of the liquid in pulsation by a water hammering generating device.

CONSTITUTION: A pipe body 33 into which a floating valve 32 is inserted in free elevation is connected with a terminal conduit 30 led from a bank 29 for checking waves, and inserted into a suction pipe 37 having a check valve 36, and a discharge pipe 40 having a check valve 39 is connected. When the movement of the floating valve 32 is restricted by valve seats 34 and 35, and the pressure in the pipe is increased by the rise and lowering of the water outside the conduit, the floating valve 32 rises, and collides with the valve seat 35, and when the floating valve 32 reaches H', the water stream is closed, and the violent water hammering is generated, and the pressure over the water stream inside the pipe is generated. When the pressure in the pipe lowers, the floating valve 32 lowers, and collides with the valve seat 34, and is closed by the L' plane, and sucks water from a water tank 38. Through the repetition of these operations, the water level can be raised over the H plane.