A double union ball valve is the most basic type of valve, with a union either side of it that enables the valve to be removed from the system and repaired or replaced quickly and efficiently, saving you time and effort. The double union ball valve operates on a full bore flow, which means that there is nothing to catch any debris within the valve. If you want fine control of your flow, this valve is not the best choice, because there's only a quarter of a turn between the valve being fully open and fully closed, which doesn't leave you much room to adjust in small amounts.
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