NEWS 2003 Archive 2004 2003 14.10.2003. MERIS DELIVERED TO BELGRADES WATERWORKS THE BIGGEST VALVE IN OUR COUNTRY DN 3000 Valve diameter 3000 mm, roughly weight 30 t, has been installed on the main drinking water supply pipeline for the city of Belgrade. The function of the valve is to be repairs damage gate valve. The manufacturer of the valve is MERIS's principal, ERHARD ARMATUREN, leading valves producer from Germany. This valve is until now the biggest one installed in water supply systems in our country.