The pump stations designed by Industrial Humidity Control includes a thermal relieve valve which functions when water in the pump becomes overheated due to excessive bypass. In simple terms, excessive bypass occurs when not enough pressurized water can flow through the high pressure outlet and returns to the pump (the pump re-pressurizes water over and over). This normally occurs when the pump capacity exceeds twice the flow capacity to any single zone with a two zones not properly sized given the pump capacity. Pump stations with two zones require evenly matched zones so that any single zone is not substantially under 50% output of the total pump capacity. To avoid this, we normally will include a variable frequency drive (VFD) which permits any amount of water output regardless of the pump capacity and any number of zones per pump station. However, when excess bypass occurs, water temperature increases to dangerous levels whereby damage to components such as seals, pistons and O-rings can occur. The thermal relieve valve functions to avoid this occurrence by routing overly heated water to drain away.
