Coolant pump – how to slow flow rate?

[JasonBModerator @jasonb]

Posted by john fletcher 1 on 29/08/2021 10:23:30:

I have several short pieces of BLUE hose as shown in Paul Lousick comments above. Can any one tell me how to join them up, I have tried hot water and hot air gun. Not there yet but keep on trying. John

The small sizes I just snap together by hand. 

 

Edited By JasonB on 30/08/2021 07:40:01

[GrottoParticipant @grotto]

Thanks for all the advice.

I've fitted a by-pass. I put a tap on it, but it wasn’t necessary and didn’t seem to add anything so I took it off.

I was running the by-pass into a T joint with the sump hose, but the sump was draining slowly, so I've separated them, and the sump drains fine, even on full flow.

Nozzle is work in progress.

Here in Auckland, we're in lockdown, so no chance to buy anything. I'm having to make do with what I've got and spends a few hours making stuff you can normally buy down the road for a few dollars, but I’m not getting bored.

[Trevor Drabble 1Participant @trevordrabble1]

Grotto , Assuming you're using a water-based soluble oil solution , my suggestion would be to simply switch to using cutting oil instead . As well as other benefits , the greater density slows the flow rate considerably. Trevor.

[noel shelleyParticipant @noelshelley55608]

WHY would you want to aerate the return flow to the tank ? I would expect this to increase the risk of microbial action. To reduce the risk of frothing or aeration in the tank on the return, take the return pipe down below the lowest level of the liquid in the tank, ie a dip tube. Good luck Noel.

[bernard towersParticipant @bernardtowers37738]

Always told by the Texaco oil rep to stir the water vigorously and drip the necessary amount of oil into the water, he said only way to guarantee total mixing.

[Mike PooleParticipant @mikepoole82104]

Coolant pumps are usually primitive affairs that are not in any danger of developing any serious pressure, they seem quite happy to have the output completely blocked and looking at the clearances the impeller has to the pump body then it will just thrash round doing not very much. The flow control tap on my coolant delivery goes from completely shut off to full flow and anywhere in between. If you don’t require any flow for an extended period then just turn the pump off. I tend to just push the delivery nozzle out of the way if I want to inspect or measure the job which saves having to reset the flow and it’s easy to just swing the nozzle back to where it was..

Mike

[Author]

Posts