Data sheet Pressure independent control valve with integrated flow limiter AVQM (PN 16) - return and flow mounting
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- Derick Ferguson
- 6 years ago
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1 Pressure independent control valve with integrated flow limiter AVQM (PN 16) - return and flow mounting Description Controllers are used together with Danfoss electrical actuators: - AMV 150 1) - AMV(E) 10 1) / AMV(E) 20 / AMV(E) 30 - AMV(E) 13 1) / AMV(E) 23 / AMV(E) 33 with spring return function - AMV 20 SL / AMV 23 SL / AMV 30 SL with stroke limitation 1) AMV 150 / AMV(E) 10 / AMV(E) 13 can be combined with DN 15 controller only. AVQM combined with AMV(E) 13, AMV(E) 23 (SL) or AMV(E) 33 (SL) has been approved according to DIN AVQM is a differential pressure independent control valve with integrated flow limiter developed for the use in district heating / cooling systems. The controller prevents flow to exceed set max flow. In a combination with electrical actuators AMV(E) and ECL electronic controllers the flow and temperature can be controlled to achieve highest energy savings. AVQM has a control valve with adjustable flow limiter, connection neck for electrical actuator and a pressure actuator with one control diaphragm. Main data: DN k VS 0,4-10 m 3 /h Flow range 0,015-6,0 m 3 /h PN 16 Differential pressure over control valve Δp MCV: 0,2 bar Temperature: - Circulation water / glycolic water up to 30 %: C Connections: - Ext. thread (weld-on, thread and flange tailpieces) Ordering Example: Differential pressure independent control valve with integrated flow limiter, DN 15; k VS 1,6; PN 16; differential pressure over control valve Δp 0,2 bar; T max 150 C; ext. thread - 1 AVQM DN 15 controller Code No: 003H6735 Option: - 1 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) 15 kvs (m 3 /h) 0,4 Connection Code No. 003H6733 1,0 003H6734 1,6 G ¾ A 003H6735 2,5 003H6736 Cylindr. ext. thread acc. to ISO 228 / 1 4,0 003H ,3 G 1 A 003H ,0 G 1¼ A 003H G 1¾ A 003H6740 DEN-SMT/SI VD.DB.V4.02 Danfoss 05/2014 1
2 Ordering (continuous) Accessories Picture Type designation DN Connection Code No H6908 Weld-on tailpieces H H H R ½ 003H6902 External thread tailpieces 20 Conical ext. thread acc. to R ¾ 003H EN R 1 003H R 1¼ 003H H6915 Flange tailpieces 20 Flanges PN 25, acc. to EN H H6917 Service kits Picture Type designation DN k VS (m 3 /h) Code No. 0,4 003H6861 1,0 003H ,6 003H6863 Valve insert 2,5 003H6864 4,0 003H ,3 003H , H6867 0,4 003H6886 1,0 003H ,6 003H6888 Control valve insert 2,5 003H6889 4,0 003H ,3 003H ,0 003H H6795 Type designation Δp setting range (bar) Code No. Actuator 0,2 003H VD.DB.V4.02 Danfoss 05/2014 DEN-SMT/SI
3 Technical data Valve Nominal diameter DN k VS value of dp controller 0,4 1,0 1,6 2,5 4,0 6,3 8,0 10 Q min 0,015 0,02 0,03 0,07 0,07 0,16 0,2 0,16 Range of max. m 3 /h p flow setting MCV = 0,2 bar Q nom 0,18 0,4 0,86 1,4 2,2 3,0 3,5 5,5 Q 2) max - - 0,9 1,6 2,4 3,5 4,5 6,0 Stroke mm Control valve authority 1 (100%) in the range of flow setting Control characteristic Logarithmic Cavitation factor z 0,6 0,55 Leakage acc. to standard IEC 534 % of k VS 0,02 0,05 Nominal pressure PN 16 Min. differential pressure see remark 1) bar Max. differential pressure 12 Medium Circulation water / glycolic water up to 30 % Medium ph Min. 7, max. 10 Medium temperature ºC valve External thread Connections Weld-on and external thread tailpieces Flange - Materials Valve body Red bronze CuSn5ZnPb (Rg5) Valve seat Stainless steel, mat. No Valve cone Dezincing free brass CuZn36Pb2As Sealing DP EPDM Sealing MCV Metal Pressure relieve Control valve insert - system Valve insert Piston Note: DP - diff. pressure controller, MCV - control valve 2 1) Q Depends on the flow rate and valve k VS ; For Q set = Q max -> p min 0,5 bar; For Q set < Q max -> pmin pmcv k VS 2) Higher max flow are achieved at higher differential pressures over AVQM controller and oppening >80%. In general at Δp > 1-1,5 bar Actuator Type AVQM Actuator size cm 2 39 Nominal pressure PN 16 Differential pressure over MCV - motorized control valve bar 0,2 Materials Housing Zinc chromatic steel, DIN 1624, No Diaphragm EPDM Impulse tube Copper tube Ø 6 1 mm DEN-SMT/SI VD.DB.V4.02 Danfoss 05/2014 3
4 Application principles - Return mounting Direct-connected heating system Indirectly connected heating system - Flow mounting Direct-connected heating system Indirectly connected heating system Installation positions Media temperature 100 C Media temperature 130 C Media temperature 150 C Electrical actuator Note! Installation positions for electrical actuators AMV(E) have to be observed as well. Please see relevant Data sheet. 4 VD.DB.V4.02 Danfoss 05/2014 DEN-SMT/SI
5 Pressure temperature diagram CuSn5ZnPb (Rg5) PN 16 working area Maximum allowed operating pressure as a function of medium temperature (according to EN ). Flow diagram Sizing and setting diagram Relation between actual flow and number of revolutions on flow restictor. Values given are approximate. DN 15 k VS 1,6 DN 32 k VS 10,0 DN 25 k VS 8,0 DN 20 k VS 6,3 DN 15 k VS 4,0 DN 15 k VS 2,5 DN 15 k VS 1,0 DN 15 k VS 0,4 Flow can be adjusted by turning flow restrictor screw counter-clockwise as shown in this diagram 1 = 120º Note: For max flow setting on the controller diagrams from Instructions should be used. Water flow shown at differential pressure across MCV 0,2 bar (20 kpa) and across the entire controller from 0,5 bar (50 kpa) to 12 bar (1200 kpa). DEN-SMT/SI VD.DB.V4.02 Danfoss 05/2014 5
6 Sizing - Directly connected heating system Example 1 Motorised control valve (MCV) for mixing circuit in direct-connected heating systems requires flow 700 l/h. Given data: Q max = 0,7 m 3 /h (700 l/h) p min = 0,8 bar (80 kpa) 1) p circuit = 0,1 bar (10 kpa) p MCV = 0,2 bar (20 kpa) default on AVQM Remark: 1) p circuit corresponds to the required pump pressure in the heating circuit and is not to be considered when sizing the AVQM. 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. k VS = 1,6 m 3 /h The min. required differential pressure across the selected controller is calculated from the formula: 2 2 Q max. 0,7 pavqm,min pmcv 0,2 k vs 1,6 p AVQM,MIN = 0,39 bar (39 kpa) p AVQM,A > p AVQM,MIN 0,8 bar > 0,39 bar Solution: The example selects AVQM DN 15; k VS value 1,6; flow setting range 0,03-0,9 m 3 /h. 6 VD.DB.V4.02 Danfoss 05/2014 DEN-SMT/SI
7 Sizing (continuous) - Indirectly connected heating system Example 2 Motorised control valve (MCV) for indirectly connected heating system control requires flow 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) = 0,2 bar (20 kpa) p MCV 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. k VS = 2,5 m 3 /h The min. required differential pressure across the selected controller is calculated from the formula: p AVQM,MIN Q k max. vs 2 p p AVQM,MIN = 0,43 bar (43 kpa) p AVQM,A > p AVQM,MIN 0,7 bar > 0,43 bar MCV 2 1,2 2,5 0,2 Solution: The example selects AVQM DN 15; k VS value 2,5; flow setting range 0,07-2,4 m 3 /h. DEN-SMT/SI VD.DB.V4.02 Danfoss 05/2014 7
8 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 13. Compression fitting for impulse tube 14. Excess pressure safety valve Function Flow volume causes pressure drop across the adjustable flow restrictor. Resulting pressures are being transferred through the impulse tubes and/or control drain in the actuator stem to the actuator chambers and act on control diaphragm for flow control. The flow restrictor diff. pressure is controlled and limited by means of built-in spring for flow control. Control valve closes on rising differential pressure and opens on falling differential pressure to control max flow. 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 control diaphragm for flow control 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. 8 VD.DB.V4.02 Danfoss 05/2014 DEN-SMT/SI
9 Dimensions 155 L H1 AMV(E) 2./ 3. + AVQM (DN 15-25) H H2 Ø 106 DN L H H 2 Weight mm (kg) , , , ,5 121 H 1 DN (mm) AMV(E) 10 + AVQM (DN 15) AMV(E) 13 + AVQM (DN 15) AMV AVQM (DN 15) L 3 L 2 L 1 d 2 n d R k SW SW SW 2) SW d L 1 L 2 L 3 k d 2 DN R 1) mm n 15 1/2 32 (G 3/4A) /4 41 (G 1A) (G 11/4A) /4 63 (G 1³/4A) ) Conical ext. thread acc. to EN ) Flanges PN 25, acc. to EN DEN-SMT/SI VD.DB.V4.02 Danfoss 05/2014 9
10 10 VD.DB.V4.02 Danfoss 05/2014 DEN-SMT/SI
11 DEN-SMT/SI VD.DB.V4.02 Danfoss 05/
12 12 VD.DB.V4.02 Produced by Danfoss A/S 05/2014
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