How can I connect 2 single spool hydraulic valves together to create up & down pressure on front-end loader?

I have a 460 Farmall, and recently mounted a front-end loader on it. I was told that I could use the 2 single spool hydraulic valves I already have, and not have to purchase a new costly 2 spool valve, for my up and down pressure. I was told to simply install a nipple fitting between the two valves. Anyone out there know about this?