Who invented the water hammer pump?

On March 7, 2005, the inventor applied for a patent for an improved device of water hammer pump, which consists of a drain valve, a check valve, an air shovel, an inlet and outlet pipe and a pump body. Characterized in that the drain valve is installed above the last end of the pump body or in front of the pump body, the center of the drain valve seat is a trumpet-shaped water inlet with a groove 45, and the valve body is a hollow cylinder. The bigger the drain around the lower part of the body, the better. The upper part of the body is equipped with an inner sliding sleeve.