Reducing gph for return pump

[jason604]

Originally Posted by sphelps

If your pump is rated at 600GPH it won't actually pump that much given there is head pressure losses from both static head and pipe friction losses. In many cases you only end up with half the rated flow, there are online calculators you can use to get better idea.

A valve on the output is fine, it just adds to the head pressure, no different than adding more height.

After testing the pump is too strong at 4 feet head so I decided to split the return line back to sump and now it's running perfectly

[MMAX]

You can choke the flow back with a ball valve if you want, but eventually it will wash it out. Always use a gate valve.

[Simons]

I think some kind of return line back to the sump from the output line or some type of valve is the only answer. That's why I like variable speed pumps so you can adjust the flow without having to add another level of plumbing. The more you add to your plumbing work the more potential issues they could be.

[mark]

Originally Posted by MMAX

You can choke the flow back with a ball valve if you want, but eventually it will wash it out. Always use a gate valve.

Wash out the ball, really?

[MMAX]

Originally Posted by mark

Wash out the ball, really?

Happens all the time in my line of work.