Differential pressure control valves

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Two-pipe heating and cooling systems are characterized by changing conditions due to valves opening and closing depending on the demand for heating or cooling. This continuously causes flow and differential pressure changes.

Without proper measurements, such systems suffer from uneven heat distribution, noise and energy inefficiency. Automatic balancing valves are the best option for these types of systems. Once installed, they optimize the system under all possible loads by controlling the differential pressure. In combination with pre-setting valves ensuring the correct flow through each radiator, and floor heating loop or cooling Terminal Unit, the system is optimized for the best possible temperature control, energy savings and noise reduction.

Danfoss offers a broad range of automatic balancing valves, partner valves and related accessories.

Return pipe mounted differential pressure controllers type ASV-P and ASV-PV
Flow pipe mounted partner valves for ASV, type ASV-BD, ASV-M and ASV-I
Flow pipe mounted combined automatic balancing, flow limiter and zone control valves type AB-PM

Features and benefits

Less complaints

The right balance will be there under all loads, resulting in less to no complaints regarding uneven heat distribution or system noise.
Better temperature control

With the automatic balancing you will achieve better temperature control in the rooms.
Energy savings

No overflows will occur in the system anymore, resulting in no waste of energy.
Save on commissioning

There will be no measuring needed for adjustments, which will mean significant savings on commissioning costs.
Effective project planning

Projects can be handled and handed over in stages, making project planning and execution easier.

Automatic balancing valves video

This animation shows how automatic balancing valves can be a great solution to improve the performance of a heating system and reduce costs at the same time.

Product range

AB-PM Automatic balancing valves- Danfoss

AB-PM differential pressure control valves

AB-PM is a combined balancing valve providing both differential pressure control and flow limitation. The valves eliminate pressure fluctuations at full load and partial load conditions and can be equipped with an actuator to allow zone control.

ASV Automatic balancing valves

ASV automatic balancing valves provide a dynamic balancing solution for two-pipe heating or cooling applications. The riser-mounted valves eliminate pressure fluctuations occurring in variable flow systems at partial load conditions. For a proper hydronic balance the valves should be combined with pre-setting valves.

Documents

Documents
Type	Name	Language	Valid for	Updated	Download	File type
Application guide	Application guide	Italian	Italy	06 Mar, 2021	10.1 MB	.pdf
Application guide	Application leaflet	Lithuanian	Lithuania	17 May, 2021	19.0 MB	.pdf
Brochure	Energy saving solutions for renovation of heating and cooling systems	Polish	Multiple	18 Feb, 2019	5.9 MB	.pdf
Brochure	Energy saving solutions for renovation of heating and cooling systems	English	Multiple	09 Sep, 2014	5.9 MB	.pdf
Brochure	Energy saving solutions for renovation of heating and cooling systems	Hungarian	Hungary	31 Aug, 2014	6.4 MB	.pdf
Brochure	Energy saving solutions for renovation of heating and cooling systems	Romanian, Moldavian, Moldovan	Romania	31 Aug, 2014	6.4 MB	.pdf
Brochure	Grow your business and discover the value of working with one partner (International version)	English	Multiple	19 Nov, 2015	5.6 MB	.pdf
Brochure	Grow your business and discover the value of working with one partner (International version)	Slovak	Slovakia	23 Mar, 2021	16.4 MB	.pdf
Application guide	HVAC Application guide	English	Multiple	25 Oct, 2020	19.4 MB	.pdf
Application guide	HVAC Application guide	Latvian	Latvia	20 Apr, 2021	20.2 MB	.pdf
Application guide	HVAC Application guide	Czech	Czech Republic	17 Nov, 2014	7.3 MB	.pdf
Application guide	HVAC Application guide	Polish	Poland	13 Jun, 2021	11.3 MB	.pdf
Application guide	HVAC Application guide	Spanish, Castilian	Spain	01 Feb, 2022	8.7 MB	.pdf
Application guide	HVAC Application guide 2021	Hungarian	Hungary	20 Sep, 2021	11.7 MB	.pdf
Brochure	Hydronic Balancing & Control product overview	Italian	Italy	06 Mar, 2021	1.0 MB	.pdf
Brochure	Hydronic Balancing & Control product overview	German	Switzerland	14 Oct, 2022	1.8 MB	.pdf
Brochure	Hydronic Balancing & Control product overview	English	United Kingdom	10 Nov, 2014	7.1 MB	.pdf
Brochure	Hydronic Balancing & Control product overview	Czech	Czech Republic	17 Nov, 2014	1.0 MB	.pdf
Brochure	Hydronic Balancing & Control product overview	English	Multiple	11 Dec, 2016	1.1 MB	.pdf
Brochure	Hydronic Balancing & Control product overview	German	Multiple	30 Aug, 2022	1.6 MB	.pdf
White paper	Practical guidelines for creating energy efficient multi-family residential heating systems	English	Multiple	15 Oct, 2015	4.3 MB	.pdf

Tender texts

ASV-PV (4th gen.) – Differential pressure controller/Automatic balancing valve DN 15-50

Branch should be balanced with a differential pressure controller for dynamic hydronic balance, with following characteristics:

Valve should keep stable differential pressure across the branch by membrane driven controller
Valve should have variable Differential pressure setting.
Minimum needed differential pressure over the valve should not be higher than 10 kPa, independently from Dp setting
Valve should have metal to metal (valve cone and seat) sealing to ensure optimal performance of differential pressure control at low flows
Differential pressure setting should be linear via visual scale and without tool, locking function should be integrated to prevent unauthorized change of setting
The setting range should be adaptable via spring replacement. Spring should be exchangeable under pressure
Valve should provide differential pressure setting range fit to application to ensure optimal system performance (such as 5-25 kPa setting range for radiator based systems)
Valve capacity per valve size should cover flow range according to VDI 2073 Standards (with water velocity of up 0.8 m/s)
Valve should have shut-off function separated from the setting mechanism. Shut-off service function should be possible to do by hand / without tool
Drain function should be integrated in valve
Valves should have integrated flushing service function. Flushing can be done with flushing accessory
Valve should be delivered with impulse tube. Inner diameter of impulse tube should not be bigger than 1.2 mm to ensure optimal performance within the system
Valve should be delivered with thermal insulation caps, up to 120°C
Valve should be delivered in reliable packaging for safe transport and handling

Product characteristics:

Pressure class: PN 16
Temperature range: 0 … +120 °C
Connection size: DN 15-50
Connection type: Internal thread ISO 7/1 (DN 15-50), External thread ISO 228/1 (DN 15-50)
Δp setting range: 5-25 kPa, 20-60 kPa
Max differential pressure across valve:1.5 bar
Installation: differential pressure controller should be mounted on return pipe with connection via impulse tube to supply pipe.

ASV-PV (3rd gen.) – Differential pressure controller/Automatic balancing valve

Branch should be balanced with a differential pressure controller for dynamic hydronic balance, with following characteristics:

Valve should keep stable differential pressure across the branch by membrane driven controller
Valve should have variable Dp setting. Setting should be hidden or lockable to prevent unauthorized changes
Setting accuracy should be within ±10% of set differential pressure, proven by independent accredited third party
Minimum needed differential pressure over the valve should not be higher than 10 kPa, independently from Dp setting
Valve should have metal to metal (valve cone and seat) sealing to ensure optimal performance of differential pressure control at low flows
Differential pressure setting should be linear throughout the setting range (1 turn 1 kPa or 1 turn 2 kPa depending on dimension)
The setting range should be adaptable via spring replacement in dimensions DN 15-40. Spring should be exchangeable under pressure
Valve should provide Dp setting range fit to application to ensure optimal system performance (such as 5-25 kPa setting range for radiator based systems)
Valve capacity per valve size should cover flow range according to VDI 2073 Standards (with water velocity of up 0.8 m/s)
Valve should have shut-off function separated from the setting mechanism. Shut-off service function should be possible to do by hand / without tool
Drain function should be integrated in valve in dimension range of DN 15-50
Valve should be delivered with impulse tube. Inner diameter of impulse tube should not be bigger than 1.2 mm to ensure optimal performance within the system
Valve in DN 15-40 range should be delivered with thermal insulation caps, min. 80°C
Valve should be delivered in reliable packaging for safe transport and handling

Product characteristics:

Pressure class: PN 16
Temperature range: -10 … +120°C
Valve size: DN 15-100
Installation: on return pipe with connection via impulse tube to supply pipe

DN 15-25:

Connection type: Internal thread ISO 7/1 and External thread ISO 228/1
Dp setting range: 5-25 kPa, 20-60 kPa
Max Dp: 1.5 bar

DN 32-40:

Connection type: Internal thread ISO 7/1 and External thread ISO 228/1
Dp setting range: 5-25 kPa, 20-60 kPa, 35-75 kPa
Max Dp: 1.5 bar

DN 50:

Connection type: External thread ISO 228/1
Dp setting range: 5-25 kPa, 20-40 kPa, 35-75 kPa, 60-100 kPa
Max Dp: 2.5 bar

DN 65-100:

Connection type: Flange EN 1092-2
Dp setting range: 20-40 kPa, 35-75 kPa, 60-100 kPa
Max Dp: 2.5 bar

ASV-I

Automatic balancing partner valve with shut-off and flowlimitation to be mounted in the supply line and connected to automatic balancing valve with impulse tube.

Valve should be delivered with threaded impulse tube connection.
Valve should have integrated shut-off function
Valve should incorporate flow limitation to set required maximum flow in the riser
Valve should be delivered with test plugs for flow verification

ASV-M

Automatic balancing partner valve with shut-off to be mounted in the supply line and connected to automatic balancing valve with impulse tube.Valve should be delivered with threaded impulse tube connection.

Valve should be delivered with threaded impulse tube connection.
Valve should have integrated shut-off function
Option to install test plugs for flow verification

ASV-BD

Automatic balancing partner valve with presetting, flowverification and shut-off to be mounted in the supply line and connected to automatic balancing valve with impulse tube.

Valve should be delivered with threaded impulse tube connection.
Shut-off function with position indicator separate from setting function
Visible presetting from all sides
Valve should have tamper proof locking of the handle
360 °rotating measuring station (drain tap and test plugs)
Possibility of draining and filling the system on both sides of the valve
Bi-directional flow possible
Self sealing, parallel test plugs for flow verification
Valve can be installed inside or outside the control loop.
Flow limitation functionality on valve can be disabled without draining the system

Software

Danfoss SET 365 software

Our advanced Danfoss SET 365 3D design software will help you to design and calculate HVAC systems with Danfoss products. A 1-year subscription is FREE available for students, designers and other interested professionals.

Danfoss SET 365 software

Learning

Whitepaper: Create energy efficient heating systems

PDF 4.4 MB

Here you can download practical guidelines for creating energy efficient multi-family residential heating systems

Videos

Save energy with Danfoss automatic balancing valves

All you need to know about hydronic balance

Case stories

Apartment block saves energy and money with AI and dynamic balancing

Centrally heated apartment buildings often suffer from variations in room temperatures due to inefficient and unbalanced heating systems. This can lead to unhappy residents complaining about lack of comfort or high energy bills. Swedish cooperative organization HSB aimed to use an intelligent monitoring and control solution to improve the energy efficiency and indoor comfort of a 12-apartment block that is connected to district heating.

New heating system with ASV automatic balancing valves in apartment building, Tallinn, Estonia

Too warm, too cold, and no chance to regulate the heating inside the individual apartments—those were the issues facing the residents in a 9-storey apartment building in Tallinn, Estonia. By upgrading the existing one-pipe system into a two-pipe system with automatic hydronic balancing, the residents now enjoy improved comfort and 25 percent savings on the energy bill.

Hydronic balancing with ASV in residential building, Milan, Italy

Some years ago, the radiators in five 9-storey apartment buildings in Milan, Italy were equipped with thermostatic radiator valves. Not until the system was fitted with automatic balancing valves, however, did the benefits of the new TRVs materialize in terms of 14 percent energy savings, less noise from the heating system, and improved indoor comfort for the residents.

Hydronic balancing for a housing association, Mjolby, Sweden

Energy efficiency and indoor comfort are top of mind among building owners today. In Sweden, the housing association Bostadsbolaget AB in Mjölby took action when they were confronted with a rising energy bill due to insufficient heat distribution in a 10-storey residential building.

ASV automatic balancing valves in buildings in 4 streets, Jonkoping, Sweden

During the past few years a huge demand for sustainable living has emerged. The pressure on creating environmental friendly or green buildings is higher than ever. Also for existing buildings the need for not leaving a big blueprint on the globe is becoming increasingly important. In Jönköping, Sweden, the community living in the Västerkåkar neighborhood is going forward. In 2013 substantial changes to the communal heating system in the buildings in four streets showed that a green example can be set, in just a couple of steps.

Balancing valves in Sky Tower, Wroclaw, Poland

The tallest building of the EU now resides in Wroclaw in Poland. As a beautiful landmark to modern architecture, high user comfort and sustainable practice, the 212 meter high Sky Tower forms the pleasant setting for thousands of people living and working in the building.

3D models and drawings

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