I have a ball valve on the end of my supply hose. I use it to reduce dripping when having to hook up inside a basement or what have you.
But a side benefit is that it keeps my hose pressurized and operating at full flow regardless of how much I unspool. I make sure to let off a little pressure before winding it up, though. Otherwise the pressure will increase beyond safe limits as it gets wrapped up (actually blew up a cheap ball valve doing this on my old rig. It was pretty awesome 
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