Pressure Independent Valve Technology: Performance and Testing Considerations

Bob Walker, Regional Application Consultant, Belimo Americas
Brian Venn, TBE, CxA, Mechanical Testing, Inc.




Pressure independent valves are commonly used in the HVAC industry to control chilled and hot water for air‐conditioning and heating. PI Valves supply a specific flow for each value of the DDC control signal regardless of pressure variations in the system. In this presentation, we will discuss valve characteristics and how they relate to hydronic coil performance, valve sizing and valve authority, and how these elements affect the equipment’s operation in the central energy plant. To conclude, a review of the different types of pressure independent valves and valve technologies.


At the conclusion of this activity, participants will be able to:

1. Define and describe the function of Pressure Independent Valves.

2. Identify the piping and pressure implications of Pressure Independent Valves.

3. Describe the operating sequence of a Mechanical Pressure Independent Valve.

4. Describe the operating sequence of an Electronic Pressure Independent Valve.

5. Explain the steps to commission a Pressure Independent Valve.


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May 19 2021


2:00 pm


  • Bob Walker
    Bob Walker
    Regional Application Consultant, Belimo Americas

    Bob Walker has over 35 years of experience in the temperature controls industry working as a Senior Application Engineer with a major controls manufacturer and a Kansas City based consulting firm designing temperature control systems and energy management upgrades. He holds a Certified Energy Manager (CEM) designation from the Association of Energy Engineers; is a LEED Green Associate; is the Vice Chair of ASHRAE’s TC 6.1 Hydronic and Steam Equipment and Systems and is a member of SSPC 41 Standard Methods for Measurement.

  • Brian Venn
    Brian Venn
    TBE, CxA, Mechanical Testing, Inc

    Brian Venn has 24 years in the Commissioning & Test and Balance Industry. Ranging from Distribution Centers to Cleanroom Environments, his experience is across all aspects of Commercial and Industrial applications of HVAC pertaining to the MEP discipline. Currently Certified by the Associated Air Balance Council as a Test and Balance Engineer. Additionally, Brian is certified as a Commissioning Authority by ACG.

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