Hydraulic piston pump system up stroke

Master slide valve is located on the dead. High pressure power fluid through the passageway from the center of the tubing into the liquid motive under a tank. Since the master control slide valve blocked passage b, fuel card management system ,the high-pressure liquid motive power fluid can not enter the tank.

The motive fluid cylinder through the passage d, the master slide valve h in the middle of the annular space to communicate with the extraction of crude oil phase.

On the motive fluid,  portable fuel transfer pump ,under the action of the cylinder under pressure, fluid motive driving the plunger upward movement of the piston pump.

He worked on the cylinder hybrid and lack of liquid crude oil lifted to the ground after extraction. When the piston rod near the top dead center, the lower part of the control slot f the lower chamber of the main spool and extraction of crude oil relative to communication, main spool will be pushed down dead, but was motivated to re-start into the next stroke ,  storage tank calibration methods ,the stroke is ended.