DESCRIPTION The FlowCon PIM™-DP series is a range of externally adjustable flanged differential pressure control valves. The purpose of the valve is to keep a constant differential pressure and thereby avoid noise from the sub-system, which the valve is controlling. Further, the FlowCon PIM™-DP can be used as shut off valve. Setting of the specific ΔP required over the controlled sub-system is externally operated and can easily be adjusted even when the valve is installed and in operation. Adjustment is done with a 13 mm (1/2”) Allen key turning the setting on the valve cap slowly (approximately one turn every 10 seconds). PIMDP.0.J PIMDP.0.K PIMDP.0.L Flow range, l/hr (GPM) Qmin Qmax Qmin Qmax Qmin Qmax 2270 (9.99) 32950 (145) 13600 (59.9) 82900 (365) 18200 (80.1) 119000 (524) HOW TO SELECT The FlowCon PIM™-DP valve is to be selected based on the calculated differential pressure across the controlled circuit (ΔpC) at design flow. The installed FlowCon PIM™-DP will hereafter ensure ΔpC never exceeds the valve set kPaD + tolerance even at partial load conditions down to the minimum flow values listed. ΔpBV Example; Design flow = 50000 l/hr = 50 m3/hr (220 GPM) Pipe size = DN100 (4”) ΔpC = 25 kPaD (3.63 psid) ΔpH ΔpC Controlled Circuit Select valves (partner valve and DPCV) based on line size ΔpV and system requirements to eliminate pipe modifications. In this example it will be FlowCon Partner Globe and FlowCon PIM™-DP. With PIMDP.0.K’s maximum flow of 82.9 m3/hr, this valve size matches both size and flow requirements. ΔpC = Controlled Δp Circuit ΔpV = Δp across FlowCon PIM™-DP Set FlowCon PIM™-DP to required (calculated) ΔpC at design flow by slowly turning the setting (+ or -) while measuring ΔpC ΔpBV = Δp across Partner Valve ΔpH = Δp Pump Head over the p/t plugs - see instruction for more details. FlowCon PIM™-DP will hereafter ensure that ΔpC never exceeds the set 25 kPaD (3.63 psid) + tolerance in the specified flow range. Note that the maximum flow value is to be limited on the partner valve. Calculate ΔpVMIN using the standard formula ΔpVMIN = (Qdesign / Kvs)2 * 100 In this case ΔpVMIN = (50 m3/hr / 120 m3/hr)2 * 100 = 17.4 kPaD (2.52 psid). Select Partner Valve - preferably a balancing valve - and determine the ΔpBV. In this case a FlowCon Partner Globe is selected. From its specification, ΔpBV is at a flow rate of 50 m3/hr in setting 6 read to be 14 kPaD (2.03 psid). Determine minimum pump head: ΔpH = ΔpBV + ΔpC + ΔpVMIN = 14 + 25 + 17.4 = 56.4 kPaD (8.18 psid) The pump can now be selected considering a pressure drop of 60 kPaD (8.7 psid). Tech note · FlowCon PIM™-DP · april 2020 · www.flowcon.com Page 3 of 4
Share
Print
Download PDF file