SBA 557: Valve Sizing 101

A control valve can look right on paper and still create control problems in the field. For building automation professionals, valve sizing directly affects what you see at the controller. Unstable loops, limited valve travel, poor response, and persistent comfort complaints may appear to be programming or tuning issues when the real problem started with valve selection. In Episode 557 of the Smart Buildings Academy Podcast, Valve Sizing 101, you'll learn how to think about control valves as precision control elements rather than simple devices for passing water. Understanding what happens between valve sizing, pressure drop, authority, and the coil can help you recognize when a hydronic problem needs more than another round of loop tuning. Topics Covered • Why valve sizing matters to BMS technicians and controls professionals • How valve authority affects modulation and control stability • What oversizing can do to valve performance and usable range • Why valve characteristics matter for heating and cooling coils • Where cavitation and flashing enter the valve sizing conversation If you work with hydronic systems, AHUs, terminal units, or control loops, this episode will help you connect what you see in the BMS to what is happening at the valve.