Danfoss AVQ Data sheet

Data sheet

Flow controller (PN 25)
AVQ - return and flow mounting

Description AVQ is a self-acting flow controller primarily for

use in district heating systems. The controller
closes when set max. flow is exceeded.

The controller has a control valve with adjustable
flow restrictor and an actuator with one control
diaphragm.

Main data:

• DN 15-50

• kVS 1.6 -25 m3/h

• Flow range 0.03-15 m3/h

• PN 25

• Flow restrictor ∆p: 0.2 bar

• Temperature:

- Circulation water / glycolic water up to 30%:
2 … 150 ˚C

• Connections:

- Ext. thread (weld-on, thread and flange
tailpieces)

- Flange

Ordering

Example:
Flow controller; DN 15; kVS 1.6; PN 25;
flow restrictor ∆ p 0.2 bar;
T

150 °C; ext. thread

max

- 1× AVQ DN 15 controller
Code No: 003H6722

Option:

- 1× Weld-on tailpieces
Code No: 003H690 8

The controller will be delivered
completely assembled, inclusive
impulse tube bet ween valve and
actuator.

AVQ Controller

Picture

DN k

(mm) (m3/h)

15

20 6.3 G 1 A 003H 6725

25 8.0 G 1¼ A 003H6726

32 12. 5 G 1¾ A 003H 6727

40 16 G 2 A 003H 6728

50 20 G 2½ A 003H6729

32 12. 5

40 20 003 H6731

50 25 003H 6732

VS

1.6

2.5 003H6723

4.0 003H 6724

Cylindr. ext. thread

acc. to ISO 228/1

Connection Code No.

003H 6722

G ¾ A

003H 6730

Flanges PN 25, acc. to EN 1092-2

© Danfoss | 2022.02 AI173286472538en-010602 | 1

Data sheet AVQ (PN 25)

Ordering (continuous)

Accessories

Picture Type designation DN Connection Code No.

15

20 003H6909

Weld-on tailpieces

25 003H 6910

32 0 03H 6911

−

40 003H6912

50 003 H6913

15

R ½ 003H6902

20 R ¾ 003H6903

External thread tailpieces

25 R 1 003H6904

32 R 1¼ 003H6905

Conical ex t. thread acc. to

EN 10226 -1

40 R 1½ 065B2004

50 R 2 065B2005

15

Flange tailpieces

20 003H6916

Flanges PN 25, acc. to EN 1092-2

25 003H6 917

Service kits

Picture Type designation DN kVS (m3/h) Code No.

1.6 003H6863

Valve insert

15

20 6.3 003H6866

25 8.0 003H6867

32 / 40 / 50 12.5 / 16 / 20 / 25 003H6868

2.5 003H6864

4.0 003H6865

003H6908

003H6 915

Technical data

Fixed set ting (bar) Code No.

Actuator

0.2 003H6 841

Valve

Nominal diameter DN 15 20 25 32 40 50

k

value

VS

Range of max.
flow setting

pb 1) = 0.2 bar

from

to

or to

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 External thread and flange

Connections

Valve body

tailpieces

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 restri ctor

2)

Depends o n the flow rate and valve kVS ; For Q

3)

Higher ma x flow are achieved at high er differential pressur es over AVQ controller. In general at Δp > 1-1. 5 bar

4)

Flange valve bod y

1.6 2.5 4.0 6.3 8.0 12. 5 16/2 0 4)20/25

0.03 0.07 0.07 0.16 0.2 0.4 0.8 0.8

m3/h

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 -

Materials

EN-GJS-400-18-LT (GGG 40.3)

Piston

= Q

-> p

set

max

≥ 0.5 bar; For Q

min

< Q

->

set

p

max

min

2





Q











k

VS





Ductile iron

p



b

4)

2 | AI173286472538en-010602 © Danfoss | 2022.02

Data sheet AVQ (PN 25)

Technical data (continuous)

Application principles

- Return mounting

- Flow mounting

Actuator

Typ e AVQ

Actuator size cm

Nominal pressure PN 25

Flow restrictor diff. pressure bar 0.2

Actuator
housing

Diaphragm EPDM

Impulse tube Copper tube Ø 6 × 1 mm

Direct-connec ted heating system Indirectly connec ted heating system

Upper casing of diaphragm

Lower casing of diaphragm Dezincing free brass CuZn36Pb2As

2

Materials

Stainless steel, mat. No.1.4301

54

Installation positions

Direct-connec ted heating system

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.

Indirectly connec ted heating system

Electrical actuator
Note!
Installation positions for electrical actuators
AMV(E) have to be observed as well. Please see
relevant Data Sheet.

AI173286472538en-010602 | 3© Danfoss | 2022.02