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The pipeline runs from the North Slope to a tanker port in Valdez. Pump Station 1 is at the beginning of the pipeline. Alyeska runs the pipeline for the five oil companies that own it: BP, Conoco, Exxon, Koch Industries and Chevron. Send to Facebook.
Thus the name open center, which refers to the open passage (gallery, core) through a valve when the spool is centered that allows the pump flow to pass through the valve unimpeded. When the spool is shifted to direct fluid from the open center passage to a work port, the pump output flows out the work port to the cylinder or motor.