Its peculiarity is that the vortex pair formed on the ejection stroke can ? move far enough under the self - induced velocity , so the vortex pair is sucked into the cavity of the actuator during the suction stroke
2.
By arrangement of the control channels through which the hydraulic fluid flows from the discharge chamber into the oil reservoir , this allows any gas bubbles being released from the hydraulic fluid during the suction stroke to be expelled into the oil reservoir