High pressure series of piston pumps with water inlet and outlet valve assembly, using super-hard copper alloy for the valve seat, have sufficient strength and excellent wearing resistance. The pumps work reliably under different working conditions to meet the demanding requirements. The valve core material is made of high-quality stainless steel to maintain long-term anti- vibration during the operation. More important, the high pressure piston pumps key parts adopt the coupling technology to cope with production, which will definitely enable you to achieve the optimal energy consumption and the best service life time.