Hydraulic System

You will get a lot more information with this post you put on another forum:

Do i know more about nigative flow control system? my questions are as
follows:-

1.What is Nigative Flow control system?

2.How does it works?

3. Is the pressure/flow is awailable when Excavator is start but no
any function is working?

4. Is the pressure/flow awailable when excavator is in working
position?

5. How does the propotional solenoid valve is working to control
displacement of a hydraulic pump?

6. From where it gets current?

Sounds like a combination of Load Sensing and Torque Limiting control of a Pressure Compensated pump. Companies often give their own names to their ideas to fool the public.

Look this article from Googling "negative flow coontrol" may be of help but it does not give much detail. However it talks about an Open Center circuit with two pumps?