The ZP Series Intelligent Hydraulic Piston pump won many patents of invention and utility model. In order to solve many problems in the waste water treatment industry, such as low efficiency, high energy consumption, complex medium situation, high pressure requirement,Sinou broke the normal design idea and adapt segmented pressure auto switch to control transmission of low pressure, high flow and high pressure, small flow. The working efficiency of filter press is greatly improved as one pump can be applied to several presses.