Data sheet Flow controller with integrated control valve (PN 16) AVQM - return and flow mounting Description The controller has a control valve with adjustable flow restrictor, connection neck for electrical actuator and an actuator with one control diaphragm. AVQM is used together with Danfoss electrical actuators: - AMV(E) 10* / AMV(E) 20 / AMV(E) 30 - AMV(E) 13* / AMV(E) 23 / AMV(E) 33 with spring return function * AMV(E) 10 / AMV(E) 13 can be combined with AVQM DN controller only. AVQM combined with AMV(E) 13, AMV(E) 23 or AMV(E) 33 has been approved according to DIN 32730. The controller is a self-acting flow controller with integrated control valve primarily for use in district heating systems. The controller closes when set max. flow is exceeded. In combination with Danfoss electrical actuators AMV(E) can be controlled by ECL electronic controllers. Main data: DN - 32 k vs 0.4-10 m 3 /h PN 16 Flow restrictor Δp: 0.2 bar Temperature: - Circulation water / glycolic water up to 30%: 2 0 C Connections: - Ext. thread (weld-on, thread and flange tailpieces) Ordering Example: Flow controller, DN, k vs 1.6, PN 16, flow restrictor Δp 0.2 bar, t max 0 C, ext. thread - 1x AVQM DN controller Code No: 003H6735 Option: - 1x Weld-on tailpieces Code No: 003H6908 The controller will be delivered completely assembled, inclusive impulse tube between valve and actuator. Electrical actuator AMV(E) must be ordered separately. AVQM Controller Picture DN (mm) Note: other controllers available on request. Accessories k vs (m 3 /h) Connection Code No. 0.4 003H6733 1.0 003H6734 1.6 G ¾ A 003H6735 2.5 Cylindr. ext. thread acc. to ISO 228/1 003H6736 4.0 003H6737 20 6.3 G 1 A 003H6738 25 8.0 G 1 ¼ A 003H6739 Picture Type designation DN Connection Code No. 003H6908 Weld-on tailpieces 20-003H6909 25 003H6910 R ½ 003H6902 External thread tailpieces 20 Conical ext. thread acc. to EN 10226-1 R ¾ 003H6903 25 R 1 003H6904 003H69 Flange tailpieces 20 Flanges PN 25, acc. to EN 1092-2 003H6916 25 003H6917 DH-SMT/SI VD.DB.V1.02 Danfoss 02/2006 1
Ordering (continuous) Service kits Picture Type designation DN k vs (m 3 /h) Code No. Valve insert Control valve insert 0.4 003H6861 1.0 003H6862 1.6 003H6863 2.5 003H6864 4.0 003H6865 20 6.3 003H6866 25 8.0 003H6867 0.4 003H6886 1.0 003H6887 1.6 003H6888 2.5 003H6889 4.0 003H6890 20 6.3 003H6891 25 8.0 003H6892 Type designation Δp setting range (bar) Code No. Actuator 0.2 003H6825 Technical data Valve Nominal diameter DN 20 25 k vs value 0.4 1.0 1.6 2.5 4.0 6.3 8.0 Range of flow rate setting (at p b * = 0.2 bar) m 3 /h Max. flow rate** (at p b * = 0.2 bar) - - 0.9 1.6 2.4 3.5 4.5 Stroke mm 5 7 Control ratio > 1:30 Control characteristic Logarithmic Cavitation factor z *** 0.6 Nominal pressure PN 25 Max. differential pressure bar 12 Medium Circulation water / glycolic water up to 30% Medium ph Min. 7, max. 10 Medium temperature 2 0 ºC Connections valve Thread tailpieces Weld-on, external thread and flange Materials Valve body Red bronze CuSn5ZnPb (Rg5) Valve seat Stainless steel, mat. No. 1.4571 Valve cone Dezincing free brass CuZn36Pb2As Sealing EPDM 0.0 0.18 0.02 0.4 0.03 0.86 0.07 1.4 0.07 2.2 0.16 3.0 0.2 3.5 * Δpb - difirental pressure across the flow restrictor; differental pressure asross the controller Δp AVQM > 0.5 bar ** max. flow rate depends on the differential pressure across the system *** k v / k vs 0.5 at DN 25 and higher Actuator Type AVQM Actuator size cm 2 39 Nominal pressure PN 16 Flow restrictor differential pressure bar 0.2 Materials Housing Zinc chromatic steel, DIN 1624, No. 1.0338 Diaphragm EPDM Impulse tube Copper tube Ø 6 1 mm 2 VD.DB.V1.02 Danfoss 02/2006 DH-SMT/SI
Application principles - Return mounting Direct-connected heating system Indirectly connected heating system - Flow mounting Direct-connected heating system Indirectly connected heating system Installation positions Up to medium temperature of 100 C the controllers can be installed in any position. For higher temperatures the controllers have to be installed in horizontal pipes only, with a pressure actuator oriented downwards. DH-SMT/SI VD.DB.V1.02 Danfoss 02/2006 3
Pressure temperature diagram working area CuSn5ZnPb (Rg5) PN 16 Maximum allowed operating pressure as a function of medium temperature (according to EN 1092-3). Flow diagram Sizing and setting diagram Relation between actual flow and number of revolutions on flow restictor. Values given are approximate. DN k vs 1.6 DN 25 k vs 8.0 DN 20 k vs 6.3 DN k vs 4.0 DN k vs 2.5 DN k vs 1.0 DN k vs 0.4 1 = 120º Flow can be adjusted by turning flow restrictor screw counter-clockwise as shown in this diagram Water flow shown at differential pressure across flow restrictor 0.2 bar (20 kpa) and across the controller from 0.5 bar (50 kpa) to 12 bar (1200 kpa). 4 VD.DB.V1.02 Danfoss 02/2006 DH-SMT/SI
Sizing - Directly connected heating system Example 1 Motorised control valve (MCV) for mixing circuit in direct-connected heating systems requires differential pressure of 0.2 bar (20 kpa) and flow less than 700 l/h. Given data: Q max = 0.7 m 3 /h (700 l/h) p min = 0.8 bar (80 kpa) * p circuit = 0.1 bar (10 kpa) p MCV = 0.2 bar (20 kpa) selected * Remark: p circuit corresponds to the required pump pressure in the heating circuit and is not to be considered when sizing the AVQM Note! Available differential pressure across the controller must be min. 0.5 bar to ensure correct control function. The total (available) pressure loss across the controller is: p AVQM,A = p min p AVQM,A = 0.8 bar (80 kpa) Possible pipe pressure losses in tubes, shut-off fittings, heatmeters, etc. are not included. Select controller from flow diagram, page 4, with the smallest possible k vs value considering available flow ranges. p k vs = 1.6 m 3 /h The min. required differential pressure across the selected controller is calculated from the 2 2 Q max. 0.7 AVQM, MIN pmcv kvs 1.6 formula: p AVQM,MIN = 0.39 bar (39 kpa) p AVQM,A > p AVQM,MIN 0.8 bar > 0.39 bar 0.2 Solution: The example selects AVQM DN, k vs value 1.6, flow setting range 0.03-0.9 m 3 /h. DH-SMT/SI VD.DB.V1.02 Danfoss 02/2006 5
Sizing (continuous) - Indirectly connected heating system Example 2 Motorised control valve (MCV) for indirectly connected heating system control requires differential pressure of 0.2 (20 kpa) bar and flow less than 1200 l/h. Given data: Q max = 1.2 m 3 /h (1200 l/h) p min = 0.8 bar (80 kpa) p exchanger = 0.1 bar (10 kpa) p MCV = 0.2 bar (20 kpa) selected Note! Available differential pressure across the controller must be min. 0.5 bar to ensure correct control function. The total (available) pressure loss across the controller is: p AVQM,A = p min - p exchanger = 0.8-0.1 p AVQM,A = 0.7 bar (70 kpa) Possible pipe pressure losses in tubes, shut-off fittings, heatmeters, etc. are not included. Select controller from flow diagram, page 4, with the smallest possible k vs value considering available flow ranges. p k vs = 2.5 m 3 /h The min. required differential pressure across the selected controller is calculated from the formula: 2 2 Q max. 1.2 AVQM, MIN pmcv kvs 2.5 p AVQM,MIN = 0.43 bar (43 kpa) p AVQM,A > p AVQM,MIN 0.7 bar > 0.43 bar 0.2 Solution: The example selects AVQM DN, k vs value 2.5, flow setting range 0.07-2.4 m 3 /h. 6 VD.DB.V1.02 Danfoss 02/2006 DH-SMT/SI
Design 1. Control valve insert 2. Adjustable flow restrictor 3. Valve body 4. Valve insert 5. Pressure relieved valve cone 6. Valve stem 7. Built-in spring for flow rate control 8. Control drain 9. Actuator 10. Control diaphragm 11. Union nut 12. Impulse tube Function Flow volume causes the pressure drop across the adjustable flow restrictor. Resulting pressures are being transferred through the impulse tube and control drain in the actuator stem to the actuator chambers and act on control diaphragm. The flow restrictor diff. pressure is controlled and limited by means of built-in spring for flow rate control. Additionally the electrical actuator will operate from zero to set max. flow according to the load. Controller is equipped with excess pressure safety valve, which protects actuator from too high differential pressure. Settings Flow setting Flow setting is being done by the adjustment of the flow restrictor position. The adjustment can be performed on the basis of flow adjustment diagram (see relevant instructions) and/or by the means of heat meter. DH-SMT/SI VD.DB.V1.02 Danfoss 02/2006 7
Dimensions DN 20 25 L 65 70 75 H 97 97 97 AMV(E) 10 277 277 283 mm H* AMV(E) 13 280 280 286 AMV(E) 2./3. 290 290 293 H2 73 73 76 Valve weight kg 1.9 1.9 2.0 AMV(E) 10 + AVQM AMV(E) 13 + AVQM AMV(E) 2./ 3. + AVQM DN 20 25 SW 32 (G ¾A) 41 (G 1A) 50 (G 1¼A) d 21 26 33 R 1) ½ ¾ 1 L1 2) 130 0 160 L2 mm 131 144 160 L3 139 4 9 k 65 75 85 d 2 14 14 14 n 4 4 4 1) Conical ext. thread acc. to EN 10226-1 2) Flanges PN 25, acc. to EN 1092-2 8 VD.DB.V1.02 Danfoss 02/2006 DH-SMT/SI