During the operation of the HANST electric pump, the one-way valve in each piston is opened, forcing the medium from the inlet side of the pump to the outlet side of the pump. The fixed-angle swash plate rotates with the drive shaft. The inclined slope causes the piston rod to reciprocate in the fixed hole seat. During the suction process, each piston rod is sucked through the pump inlet one-way valve. During the compression process, the inlet is one-way. The valve closes, and the pressure in the pump chamber continues to rise until it exceeds the load pressure. Then the outlet check valve is opened, and the medium is output from the pump chamber through the check valve. The output of each piston is combined in the pump body and discharged from the pump outlet.