Needle-shaped hydraulic control bypass valve for high-head water inlet valve

The utility model discloses a needle-shaped hydraulic control bypass valve for a high-head water inlet valve. A buffer flow guide base communicated with a valve chamber is arranged at a water inlet hole, a valve rod is sleeved with a leakage-preventing spacer bush, the leakage-preventing spacer bush is connected with the outer wall of the valve rod and the inner wall of a valve body in a sealed mode and fixed to the valve body, a hydraulic cavity is located in the valve body, a cavity opening is formed in the valve body, a hydraulic control device comprises a cylinder head provided with a travel switch base, a spring and a piston, the spring and the piston are located in the hydraulic cavity, the cylinder head is fixed to the cavity opening, the valve rod penetrates out of the cylinder head and is provided with a position display, an upper travel switch and a lower travel switch are installed on the cylinder head and matched with the position display, the piston is fixed to the valve rod and is in sliding fit