The TDL Series Automatic Recirculation Valve is a high-quality automatic solution to protect centrifugal pumps against overheating, instability and cavitation, during zero process flow and low load conditions. If the flow through the pump falls below a certain level, the bypass system opens and fluid is recirculated to provide the minimum flow through the pump.
The main flow positions the check valve at a certain point, which transmits the motion via a lever to the bypass. The bypass operates in modulating way to reduce pressure. The full minimum flow is bypassed when the check valve is seated. The bypass is fully closed when the check valve is in the upper position, allowing full flow to the system.