Profile: SE Woo Conval Co. Ltd. offers ball valves. Our products include Nuflo Macs valve, Nuflo ball valve, and Nuflo butterfly valve. Our Nuflo Mac valve has been designed to be applicable for high pressure and high temperature fluid conditions. This valve is driven by a rack and pinion mechanism. Our Nuflo ball valve has been designed to be easily and perfectly operable in any field condition.