Pressure balanced valves (PN 25) VM 2 2-way valve, external thread VB 2 2-way valve, flange

Transcription

1 Data sheet Pressure balanced valves (PN 25) 2-way valve, external thread VB 2 2-way valve, flange Description VB 2 and VB 2 are two-way valves designed to work with Danfoss electric actuators AMV(E) 0, AMV(E) 20, AMV(E) 30 or Danfoss electric actuators with spring return function AMV(E) 3, AMV(E) 23 and AMV(E) 33. These and VB 2 valves are generally recommended for use in most demanding conditions in systems such as: - district heating, - heating - hot water service with heat exchanger or storage tank where they ensure long and unproblematic performance. Features: SPLIT characteristic developed for most demanding applications High closing Δp with small sized actuators Several k VS values Push connection for easy mechanical connection with actuator Control range min. 50: Benefits: Fast and stable regulation More comfort due to stable DHW temp. Energy saving due to stable control Longer lifetime of components due to less temperature oscillation Main data: 5-50 k VS 0,25-40 m 3 /h PN 25 Temperature: - Circulation water/glycolic water up to 30 %: 2 50 C Connections: - External thread - Flange Ordering Example: 2-way valve ; 5; k VS,6; PN 25; t max 50 C; ext. thread - 5 valve : 065B204 Option: - Tailpieces : 003H6908 DEN-SMT/SI (ext. thread) Ext. thread k VS Stroke ISO 228/ (m 3 /h) (mm) 0, B200 0, B20 0, B202 5 G ¾ A, B203, B204 2, B205 4, B G A 4, B206 6, B G ¼ A 6, B207 8, B G ½ A B208 * G 3/4 A B G 2 A B G 2½ A B2020 * in discontinuation process ED.97.K8.02 Danfoss 2/203 VB 2 (flange) ) k VS Stroke (m 3 /h) (mm) 0, B2050 0, B205 0, B2052 5, B2053, B2054 2, B2055 4, B , B B B B B206 ) k VS according to VDI/VDE 273

2 Ordering (continuous) Spare parts Accessories for (set of 2 tailpieces) Valve insert Valve size 5/,0 5/2,5 5/4,0 20/4,0 20/6,3 25/6,3 25/8,0 32/0 40/6 50/25 065B B B B B B B B B B2040 Ext. thread ISO 228/ Weld-on tailpieces ) Tailpieces with ext. thread ) 5 G ¾ A 003H H G A 003H H G ¼ A 003H H G 3/4 A 003H69 2) 003H6905 2) 32 G ½ A 003H694 3) 003H6906 3) 40 G 2 A 065B B G 2½ A 065B B2005 ) weld-on tailpieces (steel), ext thread (brass) 2) for valve code No. 065B2029 (G 3/4 A) 3) for valve code No. 065B208 (G ½ A) Spare parts VB 2 Stuffing box Valve size B2070 Technical data Nominal diameter k VS value Stroke 4,0 6,3 6,3 8, m 3 /h 0,25 0,40 0,63,0,6 2,5 4,0 VB 2 6, mm 5 VB Control range > 50: Control characteristic split characteristic Cavitation factor z 0,5 Leakage acc. to standard IEC 534 max. 0,05% of k VS Nominal pressure PN 25 Medium Circulation water / Glycolic water up to 30 % Medium ph Min. 7, Max. 0 Medium temperature C 2 50 Connections External thread acc. to ISO 228- VB 2 Flange PN 25 ass. to EN Materials VM2 VB2 Valve body Red bronze (Rg 5) Ductile iron Valve cover - EN-GJS LT (GGG 40.3) Valve cone, seat and stem Stuffing box sealing Δp closing pressure Stainless steel EPDM O-rings k VS AMV(E) 0/3 AMV(E) 20/23, 30/33 (mm) (m 3 /h) (bar) (bar) 5 0,25-4, , , , , Δp closing pressure VB 2 VB 2 k VS AMV(E) 0/3 AMV(E) 20/23, 30/33 (mm) (m 3 /h) (bar) (bar) ,25-6, ED.97.K8.02 Danfoss 2/203 DEN-SMT/SI

3 Application principles Hot water service application with heat exchanger Heating application, indirect district heating substation Pressure temperature diagram EN-GJS LT (GGG 40.3) PN 25 CuSn5ZnPb (Rg5) PN 25 working area Maximum allowed operating pressure as a function of medium temperature (according to EN and EN 092-3). Split characteristic Fast and stable regulation also at small flow rates. Less temperature oscillation. Disposal The valve must be dismantled and the elements sorted into various material groups before disposal. DEN-SMT/SI ED.97.K8.02 Danfoss 2/203 3

4 Sizing Δpmax Δpmax VB 2 4 ED.97.K8.02 Danfoss 2/203 DEN-SMT/SI

5 Sizing (continuous) Example Design data: Flow rate: 0,6 m 3 /h System pressure drop: 20 kpa Locate the horizontal line representing a flow rate of 0,6 m 3 /h (line A-A). The valve authority is given by the equation: p Valve authority, a p p Where: Δp = pressure drop across the fully open valve Δp 2 = pressure drop across the rest of the circuit with a full open valve The ideal valve would give a pressure drop equal to the system pressure drop (i.e. an authority of 0,5): 2 if: Δp = Δp 2 p a 2 p 0,5 In this example an authority of 0,5 would be given by a valve having a pressure drop of 20 kpa at that flow rate (point B). The intersection of line A A with a vertical line drawn from B lies between two diagonal lines; this means that no ideally-sized valve is available. The intersection of line A A with the diagonal lines gives the pressure drops stated by real, rather than ideal, valves. In this case, a valve with k VS,0 would give a pressure drop of 36,0 kpa (point C): hencevalveauthority 36 0, The second largest valve, with k VS,6, would give a pressure drop of 4 kpa (point D): hencevalveauthority 4 0, Generally, the smaller valve would be selected (resulting in a valve authority higher than 0,5 and therefore improved control). However, this will increase the total pressure and should be checked by the system designer for compatibility with available pump heads, etc. The ideal authority is 0,5 with a preferred range of between 0,4 and 0,7. DEN-SMT/SI ED.97.K8.02 Danfoss 2/203 5

6 Dimensions SW M30,5 L L 2 L 3 H2 H a G Ød G R H3 H4 H5 + AMV(E) 0 + AMV(E) 3 + AMV(E) 20/30, 23/33 Stroke H H 2 H 3 H 4 H 5 L L 2 L 3 SW a Weight mm ISO 228/ (kg) G ¾A 0,80 20/4, G A 0,83 20/6, G A 0,83 25/6, G ¼A 0,98 25/8, G ¼A 0, G ½A, G ¾A, G 2A 2, G 2½A 3,25 k VS (m 3 /h) AMV(E) 0/3 AMV(E) 20/23; AMV(E) 30/33 5 0,25-4,0 20 4,0 20 6,3-25 6,3 25 8, Weld-on tailpieces Tailpieces with external threads L L Weld on G Ød L Weight ( ) mm (kg) 5 ¾ , ,26 25 ¼ ,38 32 ½ ,48 ¾ , , ½ 50 82,70 Ext. thread G R L Weight (mm) (kg) 5 ¾ ½ 25,5 0,8 20 ¾ 28,5 0,26 25 ¼ 33 0,38 32 ½ ¼ 36,5 0,62 ¾ ¼ 36,5 0, ½ 43 0, ½ 2 55,70 6 ED.97.K8.02 Danfoss 2/203 DEN-SMT/SI

7 Dimensions (continuous) M30,5 45 DC H L d n H2 H3 H4 VB 2 + AMV(E) 0 VB 2 + AMV(E) 3 VB 2 + AMV(E) 20/30, 23/33 Stroke H H 2 H 3 H 4 L DC d n Weight mm (kg) VB ,40 VB ,23 VB ,65 VB ,40 VB ,24 VB ,9 VB 2 k VS AMV(E) 20/23; AMV(E) 0/3 (m 3 /h) AMV(E) 30/ ,25-6, DEN-SMT/SI ED.97.K8.02 Danfoss 2/203 7

8 8 ED.97.K8.02 Produced by Danfoss A/S 2/203