Principle of Operation The FlowCon SH valves contain a diaphragm component mounted on a counter-acting spring which adjusts the pressure differential across a pre-set valve opening. The combined components operate very similar to two valves in series, where one is a pressure differential regulator and one an adjustable orifice. This is illustrated below. Principle of Construction On the below drawings P1 and P3 are system pressure, P1÷P3 is the total pressure drop across the valve. P2 is set by the diaphragm acting in reaction to P1 in the lower diaphragm chamber. Interacting with the spring, P1÷P2 remains constant, keeping a constant ΔP across the orifice areas. The result is a constant flow rate through the valve, independent of pressure fluctuations. Installation Contrary to traditional static balancing systems, dynamic balancing requires no main branch balancing valves. If a FlowCon SH valve is used at each terminal, the total flow rate of the branch will automatically be limited to the sum of the flow rates of the circuits. The FlowCon SH valve can either be installed in the supply or return line. The valve should be positioned for easy access to the adjustment and pressure measurement devices. Unlike traditional balancing valves, placement of the FlowCon SH does not require lengths of pipe before or after the valve. End Fittings The FlowCon SH valves are available with optional union connections with a range of different end fittings. The end fittings are available in any combination of size and standard. Larger sizes are for flange connection (pls. see tech notes for further information). www.flowcon.com
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