Bauer Magnum SM 540 - Self-Vacuum System for Centrifugal Pumps; Function and Design

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Operating manual for BAUER gear pump
Do not engage or disengage PTO abruptly to avoid shocks and pressure
hammers.
4.3 Self-vacuum system for centrifugal pumps
Function and design
WARNING!
evacuation pump
separator/trap
return valve
lever
spring (not shown)
centrifugal pump
ball valve
(not shown)
oil tank