Danfoss AVQM-2 Data Sheet

Data sheet
AVQM-2
Flow controller with integrated control valve
Description / Application
Combined with an electric actuator the
AVQM-2 controller is a self-acting flow
controller with integrated control valve. The
pressure difference across the control valve is
kept constantly at 0.2 bar.
The controller is primarily used in district
heating systems for circulation water with a
max. temperature of 150 oC.
AVQM-2 is used together with following
actuators:
- AMV(E) 23 / AMV(E) 33 with valve closing
safety function, type tested acc. to DIN 32 730
- AMV(E) 20 / AMV(E) 30
Nominal diameter
DN 40 and DN 50
Nominal pressure
PN 25
Connection
Flange
Flow and return mounting
Ordering
Technical data
Type
DN
AVQM-2
40
50
kvs
m3/h
16
20
2)
Because of the higher valve
opening factor (Y), the noise
level can be insignificantly
higher, depending on the
pressure ratio (XF)
Reference: 0.75 x max. flow
003H1740
003H1741
Valve
Nominal diameter
kvs value
Min. flow rate
Nominal flow
Max. flow rate 1)
Nominal pressure
Max. pressure difference
z value acc. to VDMA 24 422
1)
Code No.
(DN)
(m3/h)
(PN)
(bar)
2)
Flow medium
Medium temperature
Type of connection
Approx. valve weight
Valve body material
Seat material
Cone material
Cone seal material
(oC)
(kg)
40
16
0,8
10
12
50
20
1,0
12
15
25
16
0.6
Circulation water / Glycolic water up to 30 %
2 - 150
Flange, PN 25 DIN 2501
9
10
Ductile iron EN-GJS-400-18-LT (GGG 40.3)
Stainless steel M. No. 1.4571
Brass, stainless steel M. No. 1.4404
EPDM
Actuator
Effective surface
Nominal pressure
Diff. pressure across control valve
Max pressure difference between
(+) chamber and (-) chamber
Material
(cm 2)
(PN)
(bar)
(bar)
54
25
0.2
Body
Stainless steel M. No. 1.4301
CuZn36Pb2As*
EPDM
Copper tube Ø 5x1
1.5
Diaphragm
Impulse tubes
Approx. weight
(kg)
14
* Dezincing free brass
DEBC-SC
VD.DA.U1.02
Danfoss 01/03
1
Data sheet
AVQM-2, flow controller with integrated control valve
Application examples
Flow mounting
Return mounting
Design and operation
1
2
1
2
3
4
5
6
Electric actuator
Stroke adjustment
Cone, control valve
Seat
Cone
Pressure actuator
3
4
5
6
2
VD.DA.U1.02
Danfoss 01/03
This controller acts as flow limiter as well as
control valve. The pressure actuator keeps a
constant differential pressure across the
control valve of 0.2 bar. The flow limitation is
set by adjusting the stroke of the control
valve's cone.
DEBC-SC
Data sheet
AVQM-2, flow controller with integrated control valve
Sizing diagram
Pressure temperature diagram according to
DIN 4747 and DIN 2401
pmax. (bar)
26
PN 25
25
24
23
22
21
20
0
100
110
120
130
140
150
t (°C)
Maximum allowed operating pressure as a
function of medium temperature.
Installation
The controller AVQM-2 can be installed in
the flow and return of the system.
The installation position can be freely
chosen. If the controller is installed on the
horizontal pipe, the electric actuator should
be placed in an upward position.
Adjustment
The set-point for the flow limitation can be
adjusted with the aid of adjustment
characteristic curves (see the AVQM-2
instruction) or by a flow meter.
If insulating against heat loss, ensure that
only the valve is insulated. The electric
actuator and the pressure actuator must not
be insulated!
Possible combinations
(ordering on request)
AMV(E)2(3). / AVPQM-2
- flow controller
- differential pressure controller
- control valve
DEBC-SC
VD.DA.U1.02
Danfoss 01/03
AMV(E)2(3). / AIT /
AVQTM-2
- flow controller
- temperature controller
- control valve
3
Data sheet
AVQM-2, flow controller with integrated control valve
Dimensions
H1
H2
155
DN
L
H1
(mm)
H2
40
200
50
230
160
220
Flange: PN 25, DIN 2501
L2
AMV(E) 2(3). / AVQM-2
4
VD.DA.U1.02
Danfoss 01/03
DEBC-SC

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