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FCV

I have placed a FCV before pumpins station for flow control. I created a valve setting pattern same as the node on the downstream side to analyse it in EPS. but it is showing following errors:

1. FCV cannot deliver flow.

2. Maximum trials exceeded.System may be unstable.

3. Negative pressure at FCV.

4. Negative pressure at downstream junction.

5. Negative pressure at downstream pump

How can i fix these issues?