When pipe scale, contaminants from deliquescent dryers or other large particles present in your condensate keep plugging or holding open your common drain valve, it’s time for the DS4 Motorized Valve Drain from Gardner Denver. This valve is designed to handle all types of contaminants without clogging or sticking open. It consists of a 1/2" full-flow ball valve which will perform one full rotation in 7.5 seconds. Battery backup will provide continued operation in the event of a power failure which is something that is not available on most competitor units.