WEIR TYPE FLOW CONTROL VALVE

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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

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