English to Czech Tech/Engineering Agriculture pumps / agricultural machines

When "on demand", the pressure being created by the pump output flow is diverted to the control valve. The oil
pressure passes through the control valve and on to the stroking piston. This assists the stroking spring to keep the
pump on full demand/flow.
The rotor is on a fixed axis and continually rotates if the engine is operating. The stator ring has a linear movement
from top to bottom.
During pumping the pressure at (C) compared to (A) and also (D) compared to (B) is higher therefore the stator ring
will be forced right and down against the thrust pin and piston, DESTROKING the pump.