Danfoss AVDO Data sheet
Data Sheet
Automatic Bypass Control AVDO
Application
AVDO is a self-acting constant flow control
primarily used either to maintain minimum flow
rates through e.g. a low-capacity gas boiler or to
control the differential pressure in a central
heating system.
AVDO:
opens on rising differential pressure
▪
has a setting range of 0.05 - 0.5 bar
▪
Low-capacity gas boiler where maintenance of a min.
flow is required
is dimensioned for pressure stage PN 10,
▪
max. 120 °C
DN 15 and DN 20
▪
operates without impulse tubes
▪
On delivery valve housing is fit onto AVDO with
one of the following fittings: internal socket
thread, internal socket thread/nipple or external
thread for compression fittings.
Differential pressure control
Danfoss Heating Solutions VD55K902 © Danfoss 02/2011 1
Q
[m³/h]
∆P [bar]
Q
[m³/h]
∆P [bar]
Data Sheet Automatic Bypass Control AVDO
Ordering
Type Setting range, Connection Code no.
bar Inlet Outlet
AVDO 15
AVDO 20
AVDO 25
AVDO 15
AVDO 20
AVDO 25
AVDO 15
AVDO 20
AVDO 25
AVDO 15
AVDO 20
AVDO 25
1)
According to ISO 7/1
2)
According to ISO 228/1
0.05 - 0.5
0.05 - 0.5
0.05 - 0.5
0.05 - 0.5
Rp ½
Rp ¾
Rp 1
Rp ½
Rp ¾
Rp 1
G ¾ A
G 1 A
G 1 ¼ A
Rp ½
Rp ¾
Rp 1
1)
1)
1)
1)
1)
1)
2)
2)
2)
1)
1)
1)
R ½
R ¾
1)
R 1
R ½
R ¾
1)
R 1
G ¾ A
G 1 A
G 1 ¼ A
R ½
R ¾
1)
R 1
1)
1)
1)
1)
1)
1)
2)
2)
2)
003L6002
003L6007
003L6012
003L6003
003L6008
003L6013
003L6020
003L6025
003L6030
003L6018
003L6023
003L6028
Accessories (supplied in boxes of 10)
Copper tube fittings Code no.
AVDO 15
AVDO 20
Ø 16 x 1 013U0131
Ø 18 x 1 013U0132
Ø 18 x 1 013U0134
Ø 22 x 1 013U0135
AVDO 25 Ø 28 x 1 013U0140
Technical Data
Capacities
Setting range: 0.05 - 0.5 bar
Max. differential pressure 0.5 bar
Max. flow temperature 120 °C
Max. leakage at closed valve 50 l/h
Operation pressure PN 10
AVDO 15 AVDO 25
2 VD55K902 © Danfoss 02/2011 Danfoss Heating Solutions
Q
[m³/h]
∆P [bar]
Data Sheet Automatic Bypass Control AVDO
AVDO 20
A = set opening pressure
∆P = ∆p for valve
– - – = Upper limit graph
for recommended
application area with
almost noiseless
installation.
Measurement conditions
according to ISO 3743.
Design
Installation
Setting
Materials
Setting handle Pom-plast
1.
2. Base Ms 58
3. Spring guide PPS plastic
4. Spring Stainless steel
5. Valve cone PPS plastic
6. Valve body Ms 58, hot-pressed
7. Setting pin Stainless steel
O-rings EPDM
The valve body must be mounted with flow in
direction of the cast-in arrow.
The control is set by turning the setting dial.
AVDO has a setting scale on which the opening
pressure in bar or mwg can be directly read.
The differential pressures stated for a given
setting are indicative.
The scale gives the differential pressure across
the AVDO when it just begins to open.
Danfoss Heating Solutions VD55K902 © Danfoss 02/2011 3
Loading...