We use the valves all the time...
1. Open three slides and pack for a trip. Once the clothes are loaded we then shut off the main slide, and close up the bedroom (front living room).
2. We keep the slides closed most of the time, and will open just the kitchen slide if we are just working around the front/kitchen.
3. When leaving a campground, the DW will finish in the back and let me know, I will shut the main slide off and she will draw close the bedroom slides.
Works great - Keep in mind these are valves and you need to close them all the way, not just stop aligned with the word closed. You need to close them all the way around, almost 3/4 of a turn.
Walter & Donna
2011 CC LB RAM 3500 CTD 6.7L DRW
2013 Cedar Creek 38FL
2014 Days Camping: 35