Principle of Insert Operation - FlowCon Composite and FlowCon E-JUST Inserts The flow control insert of FlowCon A/AB/ABV contains two interacting components; one that has an adjustable orifice, and one that regulates the pressure differential across the adjustable orifice. Below its pressure differential range, the valve acts as a fixed orifice. This allows a temperature control valve in the same circuit to operate with valve authority up to the set flow rate maximum. In case the differential pressure is higher than the defined max. ΔP for the insert, the diaphragm may be damaged. Principle of Insert Operation - Stainless Steel Inserts Below its pressure differential range the stainless steel insert 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 A/AB/ABV. For the FlowCon A/AB/ABV, the principle of operation is shown above and the principle of construction is shown below. P1 and P3 are system pressures, P1÷P3 is the total pressure drop across the valve. P2 is set by the diaphragm acting in reaction to P1 in the upper 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. Within 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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