Virtus | Heavy-duty Pressure and Flow Controllers

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What is Virtus?

Virtus is Danfoss‘ series of digital empowered pressure and flow controllers for hydronic balancing and control in district heating and cooling networks. Optimal hydronic balance can result in up to 20% energy saving and improved comfort because of perfect temperature (delta T) control. Virtus is a range of heavy duty differential pressure regulators and flow regulators for demanding district heating and cooling applications. They are designed to be used in power plants for energy production, transportation networks, distribution network stations and subscriber (building) substations.​

There are 2 different technical principles

DPC (Differential Pressure Controllers, in most cases used in combination with a Motorized Control Valve (MCV))​ with these type of control options:

PICV (Pressure Independent Control Valves with integrated flow limiter) with these type of control options:

Digital optimization with iSET and iNET

All Virtus controllers are build-up from a valve and a pressure actuator (also known as a pressure regulator) and are self-acting. This means they work independent of electrical energy, ensuring a high level of reliability. Most of the controllers can optionally be equipped with a remotely accessible digital actuator to optimize the performance. There is iNET functionality for intelligent NETwork balancing and iSET functionality for intelligent substation SETting. Via AMEi 6 digital actuators the set pressure or flow on the Virtus pressure actuator is electronically adjusted to increase stability and precision in especially partial load system conditions.

Retrofit solution with existing valves

Many pressure or flow controllers are found in existing situations. Here it is challenging or undesirable to exchange for a Virtus solution. For these situations where Danfoss VFG 2 or VFQ 2 valves are already in use, there is low-impact Virtus retrofit solution. The valve can continued to be used, just the pressure actuator is replaced for a Virtus actuator. All that's needed is a special adapter and (a) new impulse tube(s). Most of the new Virtus pressure actuators can also be utilized for digital optimization with iNET or iSET.

Virtus‘ key benefits

Perfect control and stability

Efficient network hydronic balancing and ΔT optimization with advanced pressure and  flow controllers ensure perfect control and stability. The design eliminates dynamic sealing, resulting in low hysteresis and optimal pressure conditions for balancing. Improved control and accuracy are achieved through split characteristic and high control ratio. Perfect hydronic balancing improves ΔT, reducing operational costs and improving system efficiency. Increasing ΔT by 3° can reduce primary energy generation costs by at least 1%.

Big flow capacities

Big flow capacities and optimal network design reduces investment costs and improves network efficiency. By using smaller valve DN with "XXL" flow capacity and proper network planning, investment costs can be reduced by up to 17% compared to traditional designs. Virtus provides the best flow/investment ratio.​

Remote and dynamic range-ability

​Simply and remotely increase the control ratio up to 300:1. The optional upgrade with intelligent solutions iSET or iNET, allows for remote adjustments to pressure settings. This increases the control ratio, also known as range-ability. By setting the pressure to the maximum value, the maximum flow can be increased, while lowering the pressure setting to the minimum value decreases the minimum flow. By adding the dynamic AMEi 6 actuator with iSET or iNET functionality, the range-ability can be increased up to 300:1.

Easy installation, commissioning and maintenance

​The compact pressure and flow controllers offer optimal network design and low investment costs. With their compact design and multiple installation positions, they save up to 20% of installation space. No-tool flow adjustment, easy flow/Δp setting and visible indication ensure trouble-free commissioning and operation, reducing costs.

Digital empowered for additional benefits

Having installed iSET or iNET intelligent actuators on Virtus, it enables substation or network optimization by digitalization. The intelligent actuators remotely adapt the set point and are the interlink with our electronic ECL Comfort controllers and ​Leanheat® software suite for monitoring and data-driven optimization.

Intelligent substation efficiency optimization with iSET 

​Digital actuators with iSET eliminate the temperature fluctuations in the building connected to district energy network by automatic adjustment of differential pressure (Δp) over the motorized control valve (MCV) in the substation. The control valve operates in optimal mode at every load condition, which reflects in optimal flow rates for precise and stable temperature at consumer and longer lifetime of equipment.​

Intelligent network balancing with iNET 

​The intelligent iNET remote network balancing function allows for remote Δp adjustment at the single branch level. This is particularly useful for systems with constantly changing heat consumption that require adjustments in heat distribution. By optimizing Δp at each branch, lower pumping costs can be achieved and potential problems with critical points are automatically resolved. Remote control can for example be established with Danfoss Leanheat® Monitor and ECL controller.


Type Name Language Valid for Updated Download File type
Brochure eBook | Virtus - Digital empowered heavy-duty pressure and flow controllers English Multiple 24 Jun, 2024 5.5 MB .pdf
Brochure eBook | Virtus - Digital empowered heavy-duty pressure and flow controllers Czech Czech Republic 28 Jun, 2024 4.0 MB .pdf
Brochure eBook | Virtus - Digital empowered heavy-duty pressure and flow controllers Slovenian Slovenia 11 Jul, 2024 3.3 MB .pdf
Brochure eBook | Virtus - Digital empowered heavy-duty pressure and flow controllers Croatian Croatia 11 Jul, 2024 4.6 MB .pdf
Brochure eBook | Virtus – Digital empowered heavy-duty pressure and flow controllers German Multiple 05 Apr, 2024 5.8 MB .pdf
Article Effects of digitalization of self-acting flow and pressure controllers - technical article English Multiple 25 Oct, 2018 2.3 MB .pdf
Article Perspectives on key digitalization challenges within the district energy sector English Multiple 21 Mar, 2024 7.6 MB .pdf
Brochure Virtus brochure French France 16 Apr, 2019 763.8 KB .pdf
Brochure Virtus Brochure Polish Poland 16 Feb, 2023 2.9 MB .pdf
Brochure Virtus Leaflet French Switzerland 13 Aug, 2020 1.4 MB .pdf
Brochure Virtus Leaflet Slovak Slovakia 01 Feb, 2024 3.7 MB .pdf

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