Thursday, May 10, 2012

Differential Bypass Valves

Differential bypass valves regulate pressure in hydronic heating systems that are zoned with zone valves and have a fixed-speed circulator pump. Without the bypass valve, problems can arise when certain zone valves close as the areas they control no longer need heat. Differential bypass valves prevent excessively high fluid flow velocity and the noise it can cause. They are installed after the circulator pump’s discharge and use a spring to modify system flow to more acceptable levels. SupplyHouse carries differential bypass valves manufactured by Taco and Bell & Gossett.