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DESCRIPTION The FlowCon EDP series is a range of externally adjustable differential pressure control valves. The purpose of the valve is to keep a constant differential pressure and thereby avoid noise in the sub-system that the valve is control- ling. The FlowCon EDP insert can be mounted in multiple valve housings meeting multiple installation demands and allowing valve servicing without removing the housing from the pipework. The FlowCon EDP insert holds a patented dual spring construction ensuring a large differential pressure adjustment range. Setting of the specific Δ P required over the controlled sub-system is externally operated and can easily be adjusted even when the valve is installed and in operation. The main purpose of the FlowCon EDP is to provide a valve with a large Δ P range in a flexible insert construction and still ensure easy selection, installation and maintenance of the product. EDP.1 EDP.2 EDP.3 Setting: Q min Q max Q min Q max Q min Q max Flow range, l/hr (GPM) 1.0 2.0 3.0 15 (0.066) 15 (0.066) 15 (0.066) 330 (1.45) 810 (3.57) 1390 (6.12) 15 (0.066) 15 (0.066) 15 (0.066) 1720 (7.57) 2970 (13.1) 5820 (25.6) 200 (0.88) 300 (1.32) 200 (0.88) 3670 (16.2) 5550 (24.4) 13600 (59.9) 4.0 15 (0.066) 1970 (8.67) 15 (0.066) 5890 (25.9) 270 (1.19) 13900 (61.2) 5.0 15 (0.066) 2000 (8.81) 15 (0.066) 5980 (26.3) 640 (2.82) 14000 (61.6) As the FlowCon EDP is insert-based, it is not required to let pipe size determine selected design flow and design ΔpC. The column chart to the right shows the flow span for each EDP insert size and each EDP insert will fit into valve housings available for more than one pipe diameter. 100000 10000 l/hr EDP.1 EDP.2 EDP.3 Example: Based on the EDP.1 insert (DN15, DN20 or DN25 pipe size) and a flow velocity of 0.8 m/sec, the following example flows and corresponding ΔpVmin are calculated: EDP.1 Pipe size Example flow Δ pV MIN mm (in) l/hr (GPM) kPaD (psid) 15 (1/2) 500 (2.20) 1.9 (0.28) 20 (3/4) 900 (3.96) 5.9 (0.86) 1000 25 100 (1) 1400 (6.16) 14 (2.0) 10 Tech note · FlowCon EDP · march 2024 · www.flowcon.com Page 4 of 7
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ACCESSORIES • ACC00110: • ACC00210: • ACC00121: • ACC0001: Capillary tube with fittings for connection to FlowCon QuickDisc ® partner valve. Capillary tube with fittings and adaptor for connection to FlowCon standard body tappings. 1/4” to M8 adaptor according to ISO 7.1 - compatible with FlowCon standard body tappings. Adjustment key. HOW TO SELECT The FlowCon EDP valve is to be selected based on the required flow rate and calculated differential pressure across the controlled circuit ( Δ pC) at design flow (see flow curves next page for reference). EXAMPLE: Design flow = 800 l/hr (3.52 GPM) Pipe size = DN20 (3/4”) Δ pC = 16 kPaD (2.32 psid) (design condition) Select valves (partner valve and DPCV) based on line size and system requirements to eliminate pipe modifications. In this example it will be FlowCon QuickDisc ® and FlowCon EDP.1. Δp H Δ pC Δ pBV Δ pV Controlled Circuit Select FlowCon EDP setting based on required (calculated) Δ pC at design flow. From the EDP.1 flow curves, proper setting is found in the intersection between needed Δ pC and design flow. Δ pC = Controlled Δ p Circuit Δ pV = Δ p across FlowCon EDP Δ pBV = Δ p across Partner Valve Δ pH = Δ p Pump Head To optimize the system energy efficiency, select the setting providing closest higher Δ pC. In this case setting 3.1 will be the proper choice. EDP.1 will with this setting allow 800 l/hr (3.52 GPM) at the design Δ pC. Note that the maximum flow value is to be limited either on the partner valve or on the radiator thermostats. Calculate Δ pV MIN using the standard formula Δ pV MIN = (Q design / Kvs) 2 * 100 In this case Δ pV MIN = (0.8 m 3 /hr / 3.7 m 3 /hr) 2 * 100 = 4.7 kPaD (0.68 psid). Select Partner Valve – preferably a balancing valve – and determine the Δ pBV. In this case a FlowCon QuickDisc ® is selected. From its specification Δ pBV is calculated to 2.0 kPaD (0.29 spid). Determine minimum pump head: Δ pH = Δ pBV + Δ pC + Δ pV MIN = 2.0 + 16 + 4.7 = 22.7 kPaD (3.29 psid) The pump can now be selected considering a pressure drop of 25 kPaD (3.63 psid). FlowCon EDP in setting 3.1 will hereafter ensure that the Δ pC never exceeds 16 kPaD (2.32 psid) + tolerance in the specified flow range. Tech note · FlowCon EDP · march 2024 · www.flowcon.com Page 5 of 7
