WEIR TYPE FLOW CONTROL VALVE

Hi  I am interested to find out whether Direct Sealing Weir Type Diaphragm Type Flow Control Valves used for drinking water distribution can control Flow in a better way or they are mainly used for On-Off type valve only?   What are the advantages and / or disadvantages of Direct Sealing Weir Type Valve against conventional Flow Control Valve - Globe Type with removable seat and stem?  Any information shall be highly appreciated. Kiran Shah