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I am using a 1/2 hp sump pump to provide flood coolant to a CNC milling machine. The sump pump has a 1.5" outlet. The milling machine already has a 1/2" adapter and manifold which connect to Loc-Line hoses that each have a ball-valve for on-off.

Where is the best place to put the 1.5" -> 0.5" reducer? I'm debating whether I should do that at the sump outlet, or if I should run a length of pipe (PVC or other) close to the sump's outlet diameter and then use the reducer closer to the manifold. Does it make a difference?

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    $\begingroup$ Restrict at outlet and bleed off excess if your pump suffers from the restriction. Best would be to adjust pump energy input, but that's not always possible... $\endgroup$
    – Abel
    Nov 21, 2023 at 1:28
  • $\begingroup$ Thanks. When you say "bleed off excess", do you mean something like a T connection with one end to the system and the other end open? $\endgroup$
    – Maxthecat
    Nov 21, 2023 at 3:26
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    $\begingroup$ Tee but with a valve to "open" (back to sump as solar mike answered below). That return is usually easier closer to the pump. $\endgroup$
    – Abel
    Nov 21, 2023 at 11:18

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I would add a by-pass valve back to the sump.

That will allow the flow to be controlled from max to min.

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  • $\begingroup$ Thanks! I'll go for this! $\endgroup$
    – Maxthecat
    Nov 21, 2023 at 19:55

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