ASV Automatic balancing valves

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Danfoss ASV automatic balancing valves provide a simple, reliable and cost-effective way to create hydronic balance in two-pipe heating or cooling systems. They solve the technical issue of pressure fluctuations: the root cause of system imbalances and problems such as uneven heat distribution, noise and high energy consumption. ASV consists from two components; a return-pipe mounted differential pressure controller ASV-P or ASV-PV and flow-pipe mounted partner valve ASV-BD, ASV-I or ASV-M. An impulse tube connects both valves so the differential pressure over the riser can be controlled. In combination with Danfoss RA-N or RA-UN pre-setting valves on the radiators a perfectly balanced system, in both full and partial load conditions, is achieved.

View the 3D model

The 4th generation of ASV-PV offers many unique product innovations. It is designed based on the needs from installers, designers and consultants with a focus on time saving during installation and commissioning of the system.

Features and benefits

Visible setting scale

Simple adjustment of the differential pressure setting, no special equipment is required. The clearly visible setting scale makes it easy to determine if the setting is adjusted correctly. The setting ring can be locked to prevent unauthorized adjustments.
Short build in height

The installation dimensions are decreased for flexible and convenient installation.
Faster and better flushing

Increase the reliability of the system by flushing it and remove before putting the system into operation. To flush and fill a system faster, the ASV-PV valve can temporarily be locked in an open position by a flushing ring accessory.
Integrated membrane

The valve body and pressure membrane are combined into one component. This design ensures optimal low flow performance and extremely ideal differential pressure sensitivity for each individual DN size valve.

Features and functionalities of Danfoss ASV-PV

A series of 5 animations describing the challenges, backgrounds and solutions for hydronic balancing of two-pipe heating systems in multi-family buildings.

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	ASV automatic balancing valves Drive energy efficiency and increase customer satisfaction	Polish	Poland	03 Nov, 2025	819.1 KB	.pdf
Brochure	ASV automatic balancing valves Drive energy efficiency and increase customer satisfaction	Hungarian	Hungary	22 Aug, 2017	1.1 MB	.pdf
Brochure	ASV automatic balancing valves Drive energy efficiency and increase customer satisfaction	English	Multiple	26 May, 2016	333.6 KB	.pdf
Brochure	ASV automatic balancing valves Drive energy efficiency and increase customer satisfaction	German	Multiple	27 Jan, 2022	2.2 MB	.pdf
Brochure	ASV automatic balancing valves Drive energy efficiency and increase customer satisfaction	Swedish	Sweden	13 Apr, 2021	2.3 MB	.pdf
Brochure	ASV automatic balancing valves Smart heating optimization increases your building's lifetime value	English	Multiple	26 May, 2016	706.1 KB	.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	English	Multiple	09 Sep, 2014	5.9 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	Romanian, Moldavian, Moldovan	Romania	31 Aug, 2014	6.4 MB	.pdf
Application guide	HVAC Application guide	Polish	Poland	13 Jun, 2021	11.3 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	Spanish, Castilian	Spain	01 Feb, 2022	8.7 MB	.pdf
Application guide	HVAC Application guide	English	Multiple	25 Oct, 2020	19.4 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	English	Multiple	11 Dec, 2016	1.1 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	German	Switzerland	14 Oct, 2022	1.8 MB	.pdf
Brochure	Hydronic Balancing & Control product overview	German	Multiple	30 Aug, 2022	1.6 MB	.pdf
Brochure	Intelligente Heizungsoptimierung dient dem Werterhalt Ihrer Gebäude	German	Germany	01 Oct, 2014	728.8 KB	.pdf
Brochure	Optimal 2 tool	English	Multiple	16 Nov, 2016	2.5 MB	.pdf
Brochure	Optimal 2 tool	Finnish	Multiple	16 Mar, 2016	2.5 MB	.pdf
Brochure	Optimal 2 tool	Danish	Multiple	05 Apr, 2016	2.5 MB	.pdf
White paper	Practical guidelines for creating energy efficient multi-family residential heating systems	English	Multiple	15 Oct, 2015	4.3 MB	.pdf
Brochure	Smart heating optimization increases your building's lifetime value	Swedish	Sweden	23 Feb, 2015	723.3 KB	.pdf
Brochure	Two-pipe solutions: upgrade your two-pipe system with our Renovation+ Solution	German	Switzerland	29 Feb, 2016	746.5 KB	.pdf
Brochure	Two-pipe solutions: upgrade your two-pipe system with our Renovation+ Solution	Hungarian	Hungary	21 Aug, 2017	1.5 MB	.pdf
Brochure	Two-pipe solutions: upgrade your two-pipe system with our Renovation+ Solution	English	Multiple	26 May, 2016	1.2 MB	.pdf
Brochure	Two-pipe solutions: upgrade your two-pipe system with our Renovation+ Solution	Dutch, Flemish	Netherlands	15 Oct, 2014	646.5 KB	.pdf
Brochure	Two-pipe solutions: upgrade your two-pipe system with our Renovation+ Solution	Finnish	Finland	14 Dec, 2016	1.0 MB	.pdf
Brochure	Two-pipe solutions: upgrade your two-pipe system with our Renovation+ Solution	German	Austria	28 Aug, 2016	1.0 MB	.pdf
Brochure	Two-pipe solutions: upgrade your two-pipe system with our Renovation+ Solution	Estonian	Estonia	13 Aug, 2017	1.1 MB	.pdf
Brochure	Two-pipe solutions: upgrade your two-pipe system with our Renovation+ Solution	German	Germany	20 Feb, 2020	1.3 MB	.pdf

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

Tools and apps

Optimal 2 tool

Improve the efficiency and comfort of two-pipe radiator systems

Optimal 2 tool

Heat Selector

Danfoss Heat Selector is the best-in-class online selection tool that optimizes the planning process for heating application experts.

Heat Selector

Verify flow using Installer App

The Installer App allows you to easily verify the flow in different valves. In the Quick tools section, choose the Hydronic balancing tool. Then select the valve and the desired dimension and get the answer immediately.

Download Installer App for iOS Download Installer App for Android Read more about the Installer App

3D models and drawings

BIM library for MEP designs

Get your 3D BIM objects and start design dynamic HVAC solutions.

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.

Videos

Features and functionalities of Danfoss ASV-PV

Save energy with Danfoss automatic balancing valves

Automatic balancing solutions

Danfoss automatic balancing valves (ASV) -- How does it work and how will it benefit you?

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

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

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