For assuring the maximum flow area at outlet of plunger, the outlet runner of plunger is supposed to be streamline, which would lower the flow resistance at outlet plunger.

• 在保证柱塞出口有最大过流断面的同时，也应将柱塞出口流道设计成流线型，以此降低柱塞出口处的过流阻力。