DESIGNERS WORKING FRAME On-Off valves, 4" & 6" are designed to handle flows at 0 to 2200 GPM (550M3/H). Due to average field conditions it is recommended to install a 6" valve when having to handle flow rates above 900 GPM (200 M3/H). Regulating valves ( reducing, sustaining, flow etc.) SIZE REGULATING RATIO MAXIMUM FLOW RATE INCH UPSTREAM: DOWNSTREAM GPM/M3/H 4 12:1 220/50 4 10:1 440/100 4 8:1 660/150 4 4:1 880/200 6 2.5:1 1320/300 6 1.5:1 1760/400 The recommendations hereunder relate to minimal downstream pressure of 29 PSI/2 BAR. Lower downstream pressure requires the involvement of C Valves' application department for a valve custom design. For higher pressure ratios it is recommended to install a Fix Ratio Pressure reducing valve (0.62 of the upstream pressure) prior to and inline with a pressure reducing valve. For a few hours a month the valve can double the flow rates handled by it, for example when fighting fires etc.

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