I got the four way valve for my loader. (I also got a high capacity alternator, but skipped the block heater- temperate climate. No toothbar, yet.) To quote the loader manual;
"4 position bucket control valve type
This control valve has a two stage dump position. The first dump position (by moving the lever to the right) is the "Regular" dump position.
It has good power and control for precise dumping. This position should be used when operating another implement with the loader's control valve.
The second position (to the further right) features greater speed for dumping. These positions are separated by a "Feel" position for your convenience.'
I chose to spend to extra $40 dollars because of this description in the price list;
"B2009 Optional Four Position, Bucket Spool
Required for FZB2019 Fron Blade / Loader combination."
The front blade is apparently the "other implement" mentioned. Do I have a front blade? Nope. But I didn't want to limit my options, and for the price difference, it was a done deal. Oddly enough, my dealer never pointed me to this. I ended up quoting the part (and page) numbers as he wrote up the invoice.
From what I can tell, the three position valve actually lacks the "Regular" position described in the manual- it goes immediately, and only, to the faster position.
One difference occurs to me- on the
B7500, the loader controls stay on the tractor when the loader is removed. Unless I am mistaken, on the BX-22, the loader valve is removed along with the loader. If true, this means that the loader valve can't be "used when operating another implement".