Electric Variable Displacement Hydraulic Plunger Pump

The pressure oil of the variable displacement piston pump enters the lower cavity of the variable displacement housing through the through-hole in the pump body and the variable displacement housing through the one-way valve.

When the pull rod moves downward, it pushes the servo piston to move downward, the upper valve port of the servo valve opens, and the pressure oil in the lower cavity of the variable displacement housing enters the upper cavity of the variable displacement housing through the through-hole in the variable displacement piston.

Because the upper cavity area is larger than the lower cavity, the hydraulic pressure pushes the piston The downward movement drives the pin shaft to rotate the variable head around the center of the ball, changes the tilt angle (increase) of the variable head, and increases the flow of the plunger pump.

On the contrary, when the pull rod moves upward, the inclination angle of the variable head changes in the opposite direction, and the flow rate of the pump also changes. When the tilt angle changes to zero, the variable head changes to the direction of negative deflection angle, the liquid flow changes direction, and the inlet and outlet of the pump change.