Piston action,can be maked as the high-pressure pump. Product DescriptionFlow: 0-150 lphPressure: 0-500 BarPower: 370W,550W, 220V / 380V /400V/110V, 50/60HzDrive System: two and three phase motor,Anti-explosion motor,Frequency conversion motorFlow Control: Manual operationMaterialPump head: SUS304, SUS316,SUS304+PTFE, PVC+PTFEDiaphragm: PTFEValve: SUS304, SUS316, PVC, PTEFValve ball: ZrO2, SUS304 ...