Nice valve, works great to expand a heating zone in my basement off my first floor heating zone. I can select to have forced hot water flow through to my basement on the way to my first floor, so turn off the basement and have it the original way (a poor mans zone). More importantly there is no configuration (even half way) that you won't get water flow. Nice touch.
I did have one problem with threading in the 3/4" threaded copper sweat adapters. User more Teflon tape than you think. The thread from the standard copper fittings screws in very tightly. I ended up with the smallest of drips. I had to redo a connection and that was a pain. Still 5 stars for being a quality product.