2) Pressure Differential Range Selection FlowCon K valves are available in four different operational pressure differential ranges, i.e. 10-95 kPaD, 22-210 kPaD, 40-390 kPaD and 90-880 kPaD. This is the pressure differential across the valve itself. To select which range of operation is applicable for a particular circuit, determine the minimum and maximum pressure drops that the valve will experience during operation. The maximum typically occurs when the other circuits are closed, and the minimum when the other circuits are open. Then select one of the operating ranges which is wider than the range of pressure differential fluctuation calculated. Verification of the pressure differential across the valve is possible through the optional pressure/temperature test plugs. 3) Size Selection The FlowCon K valves are available in the following sizes: DN15, 20, 25, 32, 40, 50, 65 and 80. Standard FlowCon K valves are fixed female ISO threaded. Valve Location The hydronic function of the valve is not affected by whether it is installed on the supply or return side of the unit. The orientation of the insert access should be considered in order to have the ability to change or clear the insert of debris if necessary. Similarly, the pressure/temperature plugs should be accessible. It is important that the flow arrow of the valve be pointing in the right direction. Principle of Operation The FlowCon K valve utilizes a specific flow rate insert. Below its pressure differential range it acts as a fixed orifice (this allows a modulating valve in the same circuit to operate with valve authority up to the flow rate specified for the FlowCon K). Within the operating pressure differential range, the effective open orifice area of the insert is automatically adjusted to the point where the specified flow rate will be delivered (as the pressure differential increases, the open area closes and as it decreases, the area opens). When the pressure differential range is exceeded, the valve again becomes a fixed orifice device. This ensures that no part of the system is starved or shut down. www.flowcon.com
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