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

Documents

Documents
Type	Name	Language	Valid for	Updated	Download	File type

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

3D models and drawings

BIM library for MEP designs

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