Self-Acting Differential Pressure Relief Controller AFPA

  • Overview
  • Features and benefits
  • Documents
  • Tender text
  • Contact

AFPA is a self-acting differential pressure relief controller primarily for use in district heating systems. The
controller opens on rising differential pressure.

Features and benefits

The controller has a control valve (flange connection), an actuator with control diaphragm and a spring for differential pressure setting.


Type Name Language Valid for Updated Download File type
Data sheet AFPA-VFG 2(1) English United Kingdom 08 Jun, 2019 1.3 MB .pdf

Tender text

  • Bypass valve are to be selected on the required bypass flow rate and opening pressure loss
  • The valves shall be capable of the required opening pressure within the published spring range
  • The valves shall be installed with a partner valve to enable bypass flow measurement and flow limiting if necessary
  • The partner valves shall be fixed orifice in DN15-50 and variable orifice in DN50 (high flow) to DN400



Experts within Heating 
Greg Tracy has been working in the HVAC industry for the last 15 years. Having worked at Danfoss for 10 years, Greg managed the Danfoss Underfloor Heating division in the UK. For the last 5 years he has been working and managing the Danfoss HVAC division with consultants and contractors on some of Londons most prestigious Commercial buildings.

Greg Tracy
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