Richard.
Member
- Messages
- 18,335
- Location
- Cambridgeshire
Nice idea on spill back valve. I've ordered my pump now. It's much smaller and more powerfull than the one in the link. (Pricier too)You considered one of these,
http://www.dualpumps.co.uk/products/D3732H1311ARL__Flojet_Duplex_II_Bypass_Pump_230V
For the spill back valve think id use some kind of needle valve designed to control flow/pressure.








Computer brushless dc pumps and heat exchangers would be very good for this. I'd recommend using 6mm OD hose, it will be adequate and give a lot more freedom at the torch end. What are you using to cool the torch?