DC water-pump controllable valve with small water hammer

The utility model discloses a control valve of small water hammer of uniflow water pump. The inlet valve flap and the valve inner sheath form a control house, the inner sheath of the valve and the valve form a flow passage. The utility model is characterized in that: the inlet and outlet of the inner sheath of the valve is provided with a cone-shaped cover, the inlet valve flap is provided with cone-shaped axle with the front part smaller than the rear part. The cone-shaped axle crosses the cone-shaped cover, the space between the cone-shaped axle and the cone-shaped cover is a variable cross section with the front part larger than the rear part. The utility model has the advantages of rational and original structure. Due to the design of variable cross section with the front part larger than the rear part of the cone-shaped axle, the closing of valve flap is fast at the beginning and gradually slow to reduces the water hammer effectively at the end of closing and to shorten the whole closing period. The utility model can protect the water pump effectively and is with high value of populating.