Seated valve (PN 16 & PN 25) VFM 2 Two way valve, flange

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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

1 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 ) Mai data: DN k vs m 3 /h PN 16 & PN 25 Liear characteristic by 0-30% valve stroke ad Logarithmic characteristic by % 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 B B B B B B B B B B * B B * B B3087 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/ Z7021 Stem heater for AMV(E) 65X Z7022 Service kits Type Top cover sealig set VFM 2 DN Stuffig box DN Code No. 065B B B3530 Dafoss VD.LS.H5.02 1

2 Techical data Nomial diameter DN k VS value m 3 /h Stroke mm Rageability PN 16 >100:1 Rageability PN 25 >100:1 >80:1 Cotrol characteristic Li by 0-30% ad Log characteristic by % valve stroke Cavitatio factor z PN16 & PN 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 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 for PN 25 Stailess steel EPDM Pressure temperature diagram EN-GJL-250 (GG-25) PN 16 EN-GJS PN 25 Maximum allowed operatig pressure as a fuctio of medium temperature (accordig to EN ) Valve characteristics li log (30%) (70%) Capacity A AB Stroke Stroke Li by 0-30% ad Log by % valve stroke 2 VD.LS.H5.02 Dafoss

3 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 AMV(E) 65x VFM 2 DN 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 VD.LS.H5.02 3

4 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 The secod largest valve, with k VS 100, would give a pressure drop of 36 kpa (poit D): 36 hece valve authority if: Δp1 = Δp2 p a 2 p VD.LS.H5.02 Dafoss

5 Dimesios H k k H H d 2 L 1 d 2 VFM 2 DN 200, 250 L 1 VFM 2 DN 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 ) AMV(E) 85/86 + VFM 2 (DN ) 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 Dafoss VD.LS.H5.02 5

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8 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

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