Sundstrand Sauer Danfoss Series 20 Heavy Duty Series & Types

Sundstrand Sauer Danfoss Heavy Duty Series & Types
This series has about 8 different frame sizes (20- 27). Pumps & Motors of different displacements and sizes that can be combined for all kinds of applications.
So within all the different series there are 3 configurations:
Variable Displacement Pumps
Fixed Displacement Motors
Variable Displacement Pumps
The variable displacement pump can use either a variable or fixed input speed and produce an infinite variable output flow between 0 and max flow in either direction. And it comes with all kinds of controls.
The fixed displacement motor can go in either direction of rotation with infinite variable output speeds between 0 and max speed.
The variable displacement motor puts out a means for the motor output speed and torque range. Decreasing the displacement yields higher output speed and lower output torque.
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[@jonathanperry5741]

Hello
I have a spv 23 pump that's been modified by putzmeister. It seems to have a pipe that goes from the charge pump to a switching valve then to the back off the pump. Would this be to neutralizer the pump when it switches.
Thanks Jon