The main control valve is at top dead center. High pressure power liquid from the central tubing through the channel a into the liquid motive cylinder. The main control valve blocked channel B, hydraulic piston pump , the high-pressure power fluid can not enter the cylinder hydraulic motor.
The annular space liquid motive cylinder through the channel of D, main control
valve spool of central h and extraction of crude oil to communicate. In the fluid motive, the pressure difference of the cylinder, fuel dispenser pumps ,the liquid motive piston drives the piston upward movement of the pump.
The spent hydrodynamic fluid and the extracted crude oil were raised to the ground after the tank was worked in the cylinder.. When the piston rod close to the top dead center, hand gasoline pump and the lower control slot f the main control valve spool chamber and extraction of the oil phase communication, the main control valve spool were pushed to the bottom dead center, and the motive fluid to start into the next stroke, punching process will come to an end.
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