Data sheet Seated valve (PN 16 & PN 25) VFM 2 Two way valve, flage Descriptio Features: Low seat leakage rate (< 0,03 % of k vs ) Rageability R= >100:1 by PN 16 >100:1 by PN 25 up till DN 125 otherwise >80:1 Pressure relieved desig Valve for heatig, district heatig ad district coolig systems. VFM 2 valve ca be used together with followig Dafoss actuators: AMV(E) 655 AMV(E) 658 SU/SD AME 659 SD AMV(E) 85/86 (for VFM 2 DN 150-250) Mai data: DN 65-250 k vs 63-900 m 3 /h PN 16 & PN 25 Liear characteristic by 0-30% valve stroke ad Logarithmic characteristic by 30-100% valve stroke. Stem dow to close Medium: Circulatio water / glycolic water up to 50% Temperature: 2 ( 10*) 150 C * At temperatures from 10 C up to +2 C use stem heater Flage PN 16 & 25 coectios Push-pull coectio betwee valve ad actuator Compliace with Pressure Equipmet Directive 97/23/EC Orderig Valve VFM 2 Picture DN k VS 2) PN 16 Δp S 2) PN 25 Δp S Δp max. (bar) 1) Δp max. (bar) 1) PN 16 (m 3 /h) (bar) (bar) for AMV(E)65x for AMV(E)85/86 Code No. PN 25 Code No. 65 63 065B3500 065B3081 20 80 100 065B3501 065B3082 16 8-100 160 065B3502 065B3083 16 125 250 065B3503 065B3084 150 400 4 10 065B3504 065B3085 200* 630 10 10 7 065B3505 065B3086 3 250* 900 5 065B3506 065B3087 1) Δp max. is maximum permissible differetial pressure across the valve reffered for the whole actuatig rage of motorised valve (a fuctio of actuator's performace) 2) Δp s is maximum permissible clossig differetial pressure applied i fully closed positio of the valve, at which valve will seal tightly (close off pressure) * For DN 200 i combiatio with AMV(E)85/86: k vs is reduced by 15% For DN 250 i combiatio with AMV(E)85/86: k vs is reduced by 20% Accessories Type DN Code No. Stem heater for AMV(E) 85/86 150-250 065Z7021 Stem heater for AMV(E) 65X 65-250 065Z7022 Service kits Type Top cover sealig set VFM 2 DN 65-125 Stuffig box DN 150-250 Code No. 065B3528 065B3529 065B3530 Dafoss 2017.08 VD.LS.H5.02 1
Techical data Nomial diameter DN 65 80 100 125 150 200 250 k VS value m 3 /h 63 100 160 250 400 630 900 Stroke mm 30 34 40 50 Rageability PN 16 >100:1 Rageability PN 25 >100:1 >80:1 Cotrol characteristic Li by 0-30% ad Log characteristic by 30-100% valve stroke Cavitatio factor z PN16 & PN 25 0.45 0.40 0.35 0.25 0.21 Leakage acc. to stadard IEC 534 < 0.03 % of kvs Nomial pressure PN 16 & 25 Medium Circulatio water / glycolic water up to 50 % (stadard VDI 2035) Medium ph Mi. 7, Max. 10 Medium temperature o C 2 ( 10 1) ) 150 Coectios Flage PN 16 & 25 acc. to EN 1092-2 Materials Valve body ad cover Valve seat, coe ad spidle Stuffig box sealig 1) At temperatures from 10 C up to +2 C use stem heater Grey cast iro EN-GJL-250 (GG-25) for PN 16 Ductile iro EN-GJS-400-18 for PN 25 Stailess steel EPDM Pressure temperature diagram EN-GJL-250 (GG-25) PN 16 EN-GJS-400-18 PN 25 Maximum allowed operatig pressure as a fuctio of medium temperature (accordig to EN 1092-2) Valve characteristics li log (30%) (70%) Capacity A AB Stroke Stroke Li by 0-30% ad Log by 30-100% valve stroke 2 VD.LS.H5.02 Dafoss 2017.08
Istallatio Hydraulic coectios Mout accordig to flow directio as idicated o valve body. Valve moutig Before moutig the valve be sure that the pipes are clea ad free from swarf. It is essetial that the pipes are lied up squarely with the valve at each coectio ad that they are free from vibratios. Istall the motorized cotrol valves with the actuator i allowed positio as described below. Leave sufficiet clearace to facilitate the dismatlig of the actuator from the valve body for maiteace purposes. Note that the actuator may be rotated up to 360 with respect to the valve body by looseig the retaiig fixture. After this operatio re-tighte. Note: Istall a straier upstream of the valve (e.g. Dafoss FVR/FVF) AMV(E) FVR/FVF < < < < VFM 2 DN 65-250 + AMV(E) 65x VFM 2 DN 150-250 + AMV(E) 85 / 86 Disposal The valve must be dismatled ad the elemets sorted ito various material groups before disposal. Desig 1. Valve body 2. Valve cover 3. Stuffig box 4. Valve stem 5. Valve coe (pressure relieved) 6. Valve seat Dafoss 2017.08 VD.LS.H5.02 3
Sizig Flow Rate (liquid with specific a gravity of 1) l/sec m 3 /h Δp max k VS 900 k VS 630 k VS 400 k VS 250 k VS 160 k VS 100 k VS 63 FLOW Pressure drop kpa (100 kpa = 1bar = ~ 10 m H 2 O) Example Desig data: Flow rate: 60 m 3 /h System pressure drop: 55 kpa Locate the horizotal lie represetig a flow rate of 60 m 3 /h (lie A-A). The valve authority is give by the equatio: p1 Valve authority, a = p1+ p2 Where: Δp1 = pressure drop across the fully ope valve Δp2 = pressure drop across the rest of the circuit with a full ope valve The ideal valve would give a pressure drop equal to the system pressure drop (i.e. a authority of 0,5) I this example a authority of 0,5 would be give by a valve havig a pressure drop of 55 kpa at that flow rate (poit B). The itersectio of lie A A with a vertical lie draw from B lies betwee two diagoal lies; this meas that o ideally-sized valve is available. The itersectio of lie A A with the diagoal lies gives the pressure drops stated by real, rather tha ideal, valves. I this case, a valve with k VS 63 would give a pressure drop of 90,7 kpa (poit C): 90.7 hece valve authority 0.62 90.7 55 The secod largest valve, with k VS 100, would give a pressure drop of 36 kpa (poit D): 36 hece valve authority 0.395 36 55 if: Δp1 = Δp2 p a 2 p 1 1 0.5 4 VD.LS.H5.02 Dafoss 2017.08
Dimesios 15 30 22.5 45 45 H k k H H d 2 L 1 d 2 VFM 2 DN 200, 250 L 1 VFM 2 DN 80-150 H 2 Mi. 150 H 3 Mi. 150 k d 2 L 1 VFM 2 DN 65 L L AMV(E) 65x + VFM 2 (DN 65-250) AMV(E) 85/86 + VFM 2 (DN 150-250) Type VFM 2 PN 16 PN 25 PN 16 & PN 25 DN L L1 H k d2 Weight L L1 H k d2 Weight H1 H2 H3 mm (kg) mm (kg) mm 65 290 185 336 145 19 4 25 290 185 336 145 19 8 23.5 114 493.5-80 310 200 336 160 19 8 33 310 200 336 160 19 8 27 114 494.5-100 350 242 414 180 19 8 48 350 242 414 190 23 8 46 148 528.5-125 400 250 416 210 19 8 57 400 270 416 220 28 8 56 149 529.5-150 480 310 516 240 22 8 101 480 320 516 250 28 8 102 182.5 628.5 639 200 600 385 669 295 23 12 208 600 385 669 310 28 12 197 245 686 685 250 730 500 728 355 26 12 348 730 500 728 370 31 12 334 267 732 732 Dafoss 2017.08 VD.LS.H5.02 5
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Dafoss ca accept o resposibility for possible errors i catalogues, brochures ad other prited material. Dafoss reserves the right to alter its products without otice. This also applies to products already o order provided that such alteratios ca be made without subsequetial chages beig ecessary eady agreed. All trademarks i this material are property of the respective compaies. Dafoss ad the Dafoss logotype are trademarks of Dafoss A/S. All rights reserved. 8 VD.LS.H5.02 Dafoss DHS-SRMT/SI 2017.08