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AVDO 25
AVDO 20
AVDO 15
Self acting flow controller•
Opens on rising differential •
pressure
DN15, DN20, DN25•
Setting range of 0.05 to 0.5 bar•
Internal/External thread variants•
The AVDO range of automatic bypass
valves can be used as either differential
pressure controls or to provide a
minimum flow through a system.
Many boiler manufacturers are now
insisting that a bypass be fitted in all
installations to ensure that the volume
of water circulating through the boiler
does not fall to below a predefined
minimum, regardless of the load on
the system. Recognising the energy
efficiency advantage of such controls
the Building Regulations now require in
both new-build and boiler replacement
contexts, where a bypass is specified
by the boiler manufacturer, that an
automatic bypass is fitted. Automatic
bypass valves improve system
efficiency by opening only when there
is a need to bypass water, this usually
occurs at times of part load when
radiator thermostats in the system are
partly closed and water flow around
the boiler is restricted. In addition to
ensuring adequate flow around the
boiler, automatic bypass valves also
prevent pump pressure from climbing
significantly above design levels, thus
reducing the risk of noise in the system.
Available in a variety of sizes, the
capacity of this range of valves is very
high with large but linear changes in
water throughput for relatively small
increases in differential pressure. This
allows a 15mm valve to be used in
situations where 22mm valves are
normally required.
Setting Range 0.05 - 0.5 bar
Max. differential pressure 0.5 bar
Operation pressure PN 10
Max. flow temperature 120°C
Max. leakage at closed valve 50 l/h
Code Number Type
Setting Range
(Bar)
Inlet
Connection
Outlet
Connection
Design
003L601800 AVDO 15 0.05 - 0.5 Rp ½” Rp ½” Straight
003L602300 AVDO 20 0.05 - 0.5 Rp ¾” Rp ¾” Straight
003L602800 AVDO 25 0.05 - 0.5 Rp 1” Rp 1” Straight
003L611500 AVDO 0.05 - 0.5 15mm 15mm Straight
003L612200 AVDO 0.05 - 0.5 22mm 22mm Straight
003L612800 AVDO 0.05 - 0.5 28mm 28mm Straight
Automatic Bypass Valves
AVDO
Low capacity gas boiler
where maintenance of a
minimum flow is required
Differential pressure control
- Commercial 1
- Product Selection Guide 1
- Contact Details 2
- Danfoss Randall Limited 2
- Contents 3
- Thermostatic Radiator Valves 5
- Working Principle 6
- Combi Packs 9
- Fixed Capacity Valve Bodies 10
- Pre-Setting Valve Bodies 11
- Valves for 1-Pipe Systems 12
- RA-KE and RA-KEW 13
- RA2910 Built in Sensor 14
- RA2920 Tamperproof Sensor 14
- Remote Sensors and Adjusters 15
- RLV 15 Straight 16
- Drain Cock Adaptor 16
- RLV 15 Vertical 16
- Dimensions 17
- FEV-IF and FEV-FF 18
- Spare Parts and Accessories 19
- Copper Fittings 20
- Motorised Control Valves 21
- MotorisedControlValves 22
- Selection Guide 22
- VZL 2 and VZL 4 24
- VZ2, 3 and 4-way 25
- VRBZ 2- and 3-way 26
- AMV/E/H 130/140 27
- Accessories - Stem Heater 28
- Two-port valves 30
- Three-port valves 30
- VFS2 PN25 Flanged Valves 31
- AME and AMV 435 32
- AME 438 SU and AMV 438SU 33
- AMV/E 55/85 34
- Butterfly Valve 35
- VFY-WA with Electric Actuator 35
- Rotary Valves 36
- HRB & HFE 36
- Electrical Actuator 37
- AMB 162 & AMB 182 37
- On/Off Zone Valves 38
- AMZ 112 and AMZ 113 38
- Balancing Valves 39
- Why Use Balancing Valves? 40
- Cooling Systems 42
- Heating Systems 43
- LargeABQMplusAME 44
- ABQMActuators 46
- AME 110NL and AMV 110NL 47
- ABQMClimateSensor 49
- Automatic Balancing Valve 51
- Shut-off/Flow Limitation Valve 52
- Shut-Off Valve 53
- ManualPresettingValve 54
- LENO™ MSV-BD 55
- LENO™ MSV-S 56
- (with measuring nipples) 57
- FlowMeasurement 58
- Automatic Bypass Valves 62
- ThermostaticMixingValves 63
- TVM-H and TVM-W 63
- Flush and Bypass Assembly 64
- MiniFlush 100 64
- Connect Series 64
- ECL Electronic Controllers 66
- Easy Application System 67
- Additional Items and Sensors 71
- UltrasonicCompactHeatMeter 72
- SONOMETER 72
- Ball Valves 73
- FloorHeatingManifold 74
- RET230-CO3 76
- RET230-LS 76
- RET230-C3 76
- Heat/Cool Room Thermostats 77
- RET230 HC-3 and RET230 HCW-3 77
- Heat/Cool Thermostats 78
- 0-10v Proportional Control 78
- REP24 CO1 REP24 CO3 79
- Danfoss/Trend Cross Reference 80
- Plant and Steam Valves 80
- Actuators and Fan Coil Valves 81
- Danfoss Cross Reference Chart 82
- Danfoss Randall Ltd 84
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