I made this system 7 years ago and still use it today. This system has a coolant tank with 5 PSI of regulated air pressure. The air pushes coolant out the bottom of the tank. My system uses 2 separate lines, a coolant line and air line. The coolant line has a petcock valve to regulate the amount of coolant. A flow control valve to regulate the amount of air. The nozzle has the coolant on top and air blast below. Coolant is dripped over the air blast. The air blast propels the coolant to the tool. It really conserves on coolant and compressed air.





Flow control. These homemade valves did not work that well. They could not maintain the adjustment but they show the general idea of control:



Jim