Data sheet
Differential pressure and flow controller (PN 25)
AVPQ – return mounting, adjustable setting
AVPQ 4 – flow mounting, adjustable setting
Description
Ordering
Example:
Differential pressure and flow
controller; return mounting;
DN 15; kVS 1.6; PN 25;
setting range 0.2-1.0 bar;
T
150 °C; ext. thread
max
- 1× AVPQ DN 15 controller
Code No: 00 3H 6531
- 1× Impulse tube set AV, R ⁄
Code No: 003H6 852
Option:
- 1× Weld-on tailpieces
Code No: 003H6908
The controller will be delivered
completely assembled, inclusive
impulse tube(s) between valve and
actuator. External impulse tube (AV)
must be ordered separately.
AVPQ
AVPQ Controller (return mounting)
DN
k
Picture
(mm)
VS
(m3/h)
0.4
1.0 003 H6919 003 H6921
15
1.6 003 H6531 003H6539
2.5 003H6532 003H6540
Cylin dr.
4.0 003H6 533 003H6541
20 6.3 G 1 A 003H6534 003H6542
25 8.0 G 1¼ A 003H6535 003H6543
32 12. 5 G 1¾ A 003H6536 003H6544
40 16 G 2 A 003H6537 003H6545
50 20 G 2½ A 003H6538 003H 6546
32 12. 5
40 20 003H6564 003H 6567
50 25 003H6565 003H 6568
ext.
thread
acc. to
ISO 228/1
Flanges PN 25,
acc. to EN 1092-2
AVPQ 4
Connection
G ¾ A
AVPQ(4) is a self-acting differential pressure
and flow controller primarily for use in district
heating systems. The controller closes on rising
differential pressure or when set max. flow is
exceeded.
The controller has a control valve with adjustable
flow restrictor, an actuator with two control
diaphragms and handle for differential pressure
setting.
Main data:
• DN 15-50
• kVS 0.4-25 m3/h
• Flow range: 0.015-15 m3/h
• PN 25
• Setting range: 0.2-1.0 bar/0.3-2.0 bar
• Flow restrictor ∆pb: 0.2 bar
• Temperature:
Circ. water / glycolic water up to 30% :
2 … 150 °C
• Connections:
- Ext. thread (weld-on, ext. thread and flange
tailpieces)
- Flange
Δp
setting range
(bar)
0. 2-1.0
Code No.
003 H6918
003H6563 003H6566
Δp
setting range
(bar)
0.3-2.0
Code No.
003H6920
© Danfoss | 2017.01
VD.CC.X7.02 | 1
Data sheet Differential pressure and flow controller AVPQ (4) (PN 25)
Ordering (continuous)
AVPQ 4 Controller (flow mounting)
Picture
DN
(mm)
k
VS
(m3/h)
0.4
Connection
Δp
setting range
(bar)
Code No.
003H6922
1.0 003H6923 003H6925
15
1.6 003H 6547 003H6555
2.5 003H6548 003H6556
Cylin dr.
4.0 003H6549 003H6557
20 6.3 G 1 A 003H6550 0 03H6558
25 8.0 G 1¼ A 003H6 551 003H6559
ext.
thread
acc. to
ISO 228/1
G ¾ A
0. 2-1.0
32 12.5 G 1¾ A 003H6552 003H6560
40 16 G 2 A 003H6553 003H6561
50 20 G 2½ A 003H6554 003H6562
32 12.5
40 20 003H 6570 003H6573
Flanges PN 25, acc.
to EN 1092-2
003H6569 003H6572
50 25 003 H6571 0 03H6 574
Δp
setting range
(bar)
0.3-2.0
Accessories
Picture Type designation DN Connection Code N o.
15
20 003H6909
Weld-on tailpieces
External thread tailpieces
Flange tailpieces
25 00 3H6910
32 0 03 H69 11
-
40 00 3H6912
50 0 03H6 913
15
R ½ 0 03H6902
20 R ¾ 003H6903
25 R 1 003H6904
Conical ex t. thread acc. to
EN 10226 -1
32 R 1¼ 003H6905
40 R 1½ 065B2004
50 R 2 065B2005
15
Flanges PN 25, acc. to EN 1092-2
20 003H 6916
25 0 03H6 917
Code No.
003H6924
003H6908
003H 6915
2 | © Danfoss | 2017.01
Description:
Impulse tube set AV
- 1x copper tube Ø6 × 1 × 1500 mm
- 1x compression fitting 1)
for imp. tube connection to pipe Ø6 × 1 mm
1)
10 compression f ittings for imp. tube connection to pipe, Ø6 × 1 mm R ⁄ 003H6857
1)
10 compression f ittings for imp. tube connection to pipe, Ø6 × 1 mm R ⁄ 003H6858
1)
10 compression f ittings for imp. tube connection to pipe, Ø6 × 1 mm R ½ 003H6859
1)
10 compression f ittings for imp. tube connection to actuator, Ø6 × 1 mm G ⁄ 003 H6931
Shut off valve Ø6 mm 003H0276
1)
Compression f itting consists of a nippl e, compression ring and nut.
R ⁄ 0 03H6852
R ⁄ 003H6853
R ½ 003H6854
VD.CC.X7.02
Data sheet Differential pressure and flow controller AVPQ (4) (PN 25)
Ordering (continuous) Service kits
Picture Type designation DN
15
Valve insert
20 6.3 003H6866
25 8.0 003H6867
32 / 40 / 50
k
VS
(m3/h)
0.4 003H6861
1.0 003H6862
1.6 003H6863
2.5 003H6864
4.0 003H6865
12.5 / 16 / 20 / 25
Code No.
003H6868
Technical data
Picture Type designation
∆p setting range
(bar)
Code No.
AVPQ AVPQ 4
0. 2-1.0 003H6 833 003H6838
Actuator with adjustable handle
0.3-2.0 003H6850 0 03H6851
Valve
Nominal diameter DN 15 20 25 32 40 50
kVS value
from
Range of max.
flow setting
∆pb 1) = 0.2 bar
to
or to
m3/h
3)
Cavitation factor z ≥ 0.6 ≥ 0. 55 ≥ 0.5
Leakage acc. to standard IEC 534 % of k
Nominal pressure PN 25
Min. differential pressure
Max. differential pressure 20 16
Medium Circulation water / glycolic water up to 30%
Medium pH Min. 7, max. 10
Medium temperature °C 2 … 150
valve External thread Ext. thread and flange
Connections
tailpieces
Materials
Valve body
thread Red bronze CuSn5ZnPb (Rg5)
flange -
Valve seat Stainless steel, mat. No. 1.4571
Valve cone Dezincing free brass CuZn36Pb2As
Sealing EPDM
Pressure relieve system
1)
∆pb - differe ntial pressure over flow rest rictor
2)
Depends o n the flow rate and valve kVS ; For Q
3)
Higher max flow ar e achieved at higher dif ferential pressures over AVPQ(4) control ler. In general at p > 1-1.5 bar
4)
Flange valve body
0.4 1.0 1.6 2.5 4.0 6.3 8.0 12 .5 16/20 4)20/25
0. 015 0.02 0.03 0.07 0.07 0.16 0.2 0.4 0.8 0.8
0.18 0.4 0.86 1.4 2.2 3.0 3.5 8.0 10 12
- - 0.9 1.6 2.4 3.5 4.5 10 12 15
VS
bar
≤ 0.02 ≤ 0.05
see remark
2)
Weld-on and external thread
Flange -
EN-GJS-400-18-LT (GGG
Piston
= Q
-> ∆p
set
max
≥ 0.5 bar; For Q
min
< Q
->
set
p
max
min
2
Q
p
k
VS
Ductile iron
40. 3)
b
4)
VD.CC.X7.02
© Danfoss | 2017.01 | 3
Data sheet Differential pressure and flow controller AVPQ (4) (PN 25)
Technical data (continuous)
Application principles
- Return mounting
Actuator
Typ e AVPQ AVPQ 4
Actuator size cm
Nominal pressure PN 25
Flow restrictor dif f. pressure, ∆pb bar 0.2
Diff. pressure setting ranges and
spring colours
Materials
Housing
Diaphragm EPDM
Impulse tube Copper tube Ø6 × 1 mm
Upper casing of actuator Stainless steel, mat. No.1.4301
Lower casing of actuator Dezincing free brass CuZn36Pb2As
bar
2
0. 2-1.0 0 .3-2. 0 0.2-1. 0 0.3-2 .0
yellow red yellow red
54
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.
4 | © Danfoss | 2017.01
VD.CC.X7.02
Data sheet Differential pressure and flow controller AVPQ (4) (PN 25)
Pressure temperature
diagram
EN-GJS-400 -18-LT (GGG 40.3) PN 25
CuSn5ZnPb (Rg5) PN 25
Maximum allowed operating pressure as a function of medium temperature (according to EN 1092-2 and 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 50 k
20, 25
DN 32 k
VS
12. 5
VS
DN 15 k
DN 15 k
DN 25 k
DN 20 k
DN 15 k
2.5
VS
1.6
VS
DN 40 k
8.0
VS
6.3
VS
4.0
VS
DN 15 k
DN 15 k
16, 2 0
VS
1.0
VS
0.4
VS
VD.CC.X7.02
Flow can be adjusted by turning flow restrictor screw
counter-clockwise as shown in this diagram.
Water flow shown at dif ferential pressure across flow
Remark:
Controllers D N 40 and DN 50 have the same cur ve up to 9
revolutions.
1 = 360 º
restrictor 0.2 bar (20 kPa) and across the controller
from 0.5 bar (50 kPa) to 16/20 bar (1600/2000 kPa).
Note:
For max flow s etting on the controlle r diagrams from Instructi ons
should be used .
© Danfoss | 2017.01 | 5
Data sheet Differential pressure and flow controller AVPQ (4) (PN 25)
Sizing
- Directly connected heating
system
Example 1
Motorised control valve (MCV) for mixing circuit
in direct-connected heating system requires
differential pressure of 0.3 bar (30 kPa) and flow
less than 1900 l/h.
Given data:
Q
= 1.9 m3/h (1900 l/h)
max
∆p
= 0.9 bar (90 kPa)
min
∆p
1) = 0.1 bar (10 kPa)
circuit
∆p
= 0.3 bar (30 kPa) selected
MCV
∆pb 2) = 0.2 bar (20 kPa)
Remark:
1)
∆p
corresponds to th e required pump pressure in th e
circuit
heating circui t and is not to be considered when siz ing the
AVPQ (4).
2)
∆pb is differe ntial pressure over flow rest rictor.
The differential pressure set value is:
∆p
∆p
= ∆p
set value
= 0.3 bar (30 kPa)
set value
MCV
Q
max
The total pressure loss across the controller is:
∆p
= ∆p
AVPQ
∆p
= 0.6 bar (60 kPa)
AVPQ
min
− ∆p
= 0.9 – 0.3
MCV
Possible pipe pressure losses in tubes, shut-off
fittings, heatmeters, etc. are not included.
kv value is calculated according to formula:
Q
k
v
max
pp
bAVPQ
9.1
2.06.0
kv = 3.0 m3/h
Solution:
The example selects AVPQ(4) DN 15, kVS value 4.0,
with differential pressure setting range 0.2-1.0 bar
flow setting range 0.07-2.4 m3/h.
,
p
p
p
p
circuit
circuit
min
AVPQ
p
b
p
AVPQ
AVPQ 4
Q
max
min
p
b
p
AVPQ
p
p
MCV
MCV
6 | © Danfoss | 2017.01
VD.CC.X7.02
Data sheet Differential pressure and flow controller AVPQ (4) (PN 25)
Sizing (continuous)
- Indirectly connected heating
system
Example 2
Motorised control valve (MCV) for indirectly
connected heating system requires differential
pressure of 0.3 (30 kPa) bar and flow less than
1150 l/ h.
Given data:
Q
= 1.15 m3/h (1150 l/h)
max
∆p
= 1.0 bar (100 kPa)
min
∆p
∆p
∆pb 1) = 0.2 bar (20 kPa)
Remark:
1)
∆pb is differe ntial pressure over flow rest rictor
= 0.05 bar (5 kPa)
exchanger
= 0.3 bar (30 kPa) selected
MCV
The differential pressure set value is:
∆p
∆p
∆p
= ∆p
set value
set value
set value
exchanger
= 0.05 + 0.3
= 0.35 bar (35 kPa)
+ ∆p
Q
max
MCV
The total pressure loss across the controller is:
∆p
= ∆p
AVPQ
∆p
= 1.0 − 0.05 − 0.3
AVPQ
∆p
= 0.65 bar (65 kPa)
AVPQ
min
− ∆p
exchanger
− ∆p
MCV
Possible pipe pressure losses in tubes, shut-off
fittings, heatmeters, etc. are not included.
kv value is calculated according to formula:
Q
k
v
max
pp
bAVPQ
15.1
2.065.0
kv = 1.7 m3/h
Solution:
The example selects AVPQ(4) DN 15, kVS value
2.5, with differential pressure setting range
0.2-1.0 bar, flow setting range 0.07-1.6 m3/h.
p
p
p
p
exchanger
exchanger
min
AVPQ
p
b
p
AVPQ
AVPQ 4
Q
max
min
p
b
p
AVPQ
p
p
MCV
MCV
VD.CC.X7.02
© Danfoss | 2017.01 | 7
Data sheet Differential pressure and flow controller AVPQ (4) (PN 25)
Design
1. Cover
2. Adjustable flow restrictor
3. Valve body
4. Valve insert
5. Pressure relieved valve cone
6. Valve stem
7. Control drain
8. Control diaphragm for flow
control
9. Control diaphragm for diff.
pressure control
10. Setting spring for diff.
pressure control
11. Handle for diff. pressure
setting, prepared for sealing
12. Adjuster for diff. pressure
setting, prepared for sealing
13. Union nut
14. Compression fitting for
impulse tube
15. Upper casing of actuator
16. Lower casing of actuator
17. Impulse tube
18. Excess pressure safety valve
19. Actuator
AVPQ (0.2-1.0 bar) - return mounting
AVPQ (0.3-2.0 bar) - return mounting
8 | © Danfoss | 2017.01
AVPQ 4 - flow mounting
VD.CC.X7.02
Data sheet Differential pressure and flow controller AVPQ (4) (PN 25)
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.
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.
Pressure changes from flow and return pipes are
being transferred through the impulse tubes
to the actuator chambers and act on control
diaphragm for diff. pressure control. The diff.
pressure is controlled by means of setting spring
for diff. pressure control. Control valve closes
on rising differential pressure and opens on
falling differential pressure to maintain constant
differential pressure.
Controller is equipped with excess pressure
safety valve, which protects control diaphragm
for diff. pressure control from too high
differential pressure. In addition return version
of controller is equipped with second excess
pressure safety valve, which protects control
diaphragm for flow control from too high
differential pressure.
Differential pressure setting
Differential pressure setting is being done by
the adjustment of the setting spring for diff.
pressure control. The adjustment can be done by
means of handle for diff. pressure setting and/or
pressure indicators.
Adjustment diagram
Relation between scale figures and differential pressure. Values given are approximate.
l ll lll llll lllll
0,2 0,4 0,6 0,8 1,0 bar
20 40 60 80 100 kPa
l ll lll llll lllll
0,3 0,73 1,16 1,58 2,0 bar
30 73 116 158 200 kPa
VD.CC.X7.02
© Danfoss | 2017.01 | 9
Data sheet Differential pressure and flow controller AVPQ (4) (PN 25)
Dimensions
L1
L
Ø135
H2
H
Ø135
H3
H1
AVPQ AVPQ
DN 15-50 DN 32-50
∆ p = 0.3-2.0 bar ∆p = 0.3-2.0 bar
AVPQ (∆p = 0.3-2.0 bar)
DN
L
L1
H
H1 - - - 260 260 260
H2 73 73 76 103 103 103
H3 - - - 103 103 103
Weight (thread)
Weight (flange)
Note: Other flange dimensions - see table for tailpieces.
15 20 25 32 40 50
65 70 75 100 110 130
- - - 18 0 200 230
219 219 219 260 260 260
mm
3.2 3.2 3.4 5.9 6.0 6.7
kg
- - - 10.4 12.0 14.0
L1
L
Ø135
H H2
Ø135
H3
H1
AVPQ AVPQ
DN 15-50 DN 32-50
∆ p = 0. 2-1.0 bar ∆p = 0.2-1.0 bar
AVPQ (∆p = 0.2-1.0 bar)
DN
L
L1 - - - 18 0 200 230
H 17 5 17 5 175 217 217 2 17
H1 - - - 217 217 2 17
H2 73 73 76 103 103 103
H3 - - - 103 103 103
Weight (thread)
Weight (flange) - - - 10. 4 12 .0 14. 0
Note: Other flange dimensions - see table for tailpieces.
15 20 25 32 40 50
65 70 75 100 110 130
mm
3.2 3.2 3.4 5.9 6.0 6.7
kg
10 | © Danfoss | 2017.01
VD.CC.X7.02
Data sheet Differential pressure and flow controller AVPQ (4) (PN 25)
Dimensions (continuous)
L1
L
H3
H1
Ø135
H H2
Ø135
AVPQ 4 AVPQ 4
DN 15-50 DN 32-50
AVPQ 4
DN 15 20 25 32 40 50
L
L1 - - - 180 200 230
H 298 298 298 340 340 340
H1 - - - 340 340 340
H2 73 73 76 103 103 10 3
H3 - - - 103 10 3 103
Weight (thread)
Weight (flange) - - - 12 .5 14.1 16.2
Note: Other flange dimensions - see table for tailpieces.
65 70 75 100 110 13 0
mm
5.4 5.4 5.6 8.1 8.2 8.9
kg
L
3
L
2
L
1
d
2
n
d
SW
R
SW
k
SW
DN R
1)
SW d L
2)
L2L
1
k d
3
n
2
mm
15 ⁄ 32 (G ⁄A) 21 130 12 0 13 9 65 14 4
20 ⁄ 41 (G 1A) 26 150 131 154 75 14 4
25 1 50 (G 1⁄A) 33 160 145 159 85 14 4
32 1⁄ 63 (G 1¾A) 42 - 17 7 184 10 0 18 4
40 1 ⁄ 70 (G 2A) 47 - 20 0 204 110 18 4
50 2 82 (G 2½A) 60 - 244 234 12 5 18 4
1)
Conical ex t. thread acc. to EN 10226-1
2)
Flanges PN 25, acc. to EN 1092-2
Compression ttings
31 mm (R ⁄)
37 mm (R ⁄)
R ⁄ / R ⁄ / R ⁄
43 mm (R ⁄)
VD.CC.X7.02
© Danfoss | 2017.01 | 11
Danf
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Data sheet Differential pressure and flow controller AVPQ (4) (PN 25)
oss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products
vided that such alterations can be made without subsequential changes being necessary eady agreed.
12 | © Danfoss | DHS-SRMT/SI | 2017.01
tive companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
VD.CC.X7.02
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