Differential pressure controllers

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A differential pressure controller consists of a valve and a pressure actuator. Differential pressure controllers in the primary system are mainly used to keep a constant and lower differential pressure across a motorised control valve or a total system/substation.

As a rule of thumb, the differential pressure controller should be used whenever the ratio between maximum and minimum available differential pressure from the network is larger than 2.

A differential pressure controller can also be used to perform flow limitation in combination with a motorised control valve.

It is recommended to place the controller in the return after the components, across which a constant pressure is maintained. In certain situations – especially when the supply pressure is very high – it can be useful to install the differential pressure controller in the flow.

Features and benefits

Eliminates pressure variations and provide optimum operating conditions with improved temperature control quality.
Made for demanding systems, resistant to corrosion, cavitation and dirt.
Connected system is protected against pressure surges, fluctuations, cavitation and noise.

Variable flow in district heating and cooling systems

Balance your network, save energy and improve end user comfort by hydronic balancing and control of district energy networks.

Tools and apps

Heat Selector

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

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FAQ

Can I limit a max flow with a differential pressure regulator?

Yes you can. Open the control valve fully and set the max flow by adjusting the differential pressure. You can also calculate the appropriate differential pressure, but you need to know the exact capacity of the control valve.

We designed an installation and need lengths of valves from a project specification.

We produce valves with a standard length. You can also find the measures in our datasheet or download 2D and 3D CAD drawing models from our product presentations. Please go to our product catalog where you will find links to documentation and drawings.

We have installed a DN125 differential pressure controller, but found out that we need a bigger setting range. Do we need to order a new pressure actuator?

No, you do not need to change the pressure actuator. It will be sufficient to replace the setting spring only. Please contact your local sales or technical support for further instructions.

Videos

Benefits of differential pressure controllers in district heating or cooling systems (constant flow)