Fluid pumping assembly having a lubrication circuit functioning independent of the orientation of the fluid pumping assembly

摘要

A fluid pumping assembly including a control valve mounted in a control valve boss having an inlet exposed to the elevated discharge pressure of the discharge chamber and an outlet exposed to the reduced pressure of the crank case. The control valve is responsive to pressure differentials between the crank case and the discharge chamber and provides a fluid path between the crank case and the discharge chamber to allow lubricating fluid from the discharge chamber to be injected into the crank case through the fluid path provided by the control valve under the influence of the pressure differential existing between the crank case and the discharge chamber. The control valve boss partially bifurcates the discharge chamber to form first and second reservoirs such that oil is disposed on either side of the control valve boss in the first and second reservoirs. The assembly further includes an oil pick-up tube providing fluid communication between the control valve inlet and both the first and second oil reservoirs on either side of the control valve boss for delivering oil from both of the first and second reservoirs to the control valve inlet independent of the orientation of the fluid pumping assembly.