Lubricant delivered from the oil pump makes umbrella valve in the BFD/BFE distributor drive upwards. When the umbrella valve closes central hole of the core bar, the piston overcomes the spring force to rise. Lubricant stored in the oil cavity is drained out. When piston moves to the top point of
IntroductionVertical multistage centrifugal pumps are essential components in various industrial applications, from water treatment plants to manufacturing processes.