EB7 – Back Pressure Valves 

EB7 – Back Pressure Valves

An automatic recirculation valve is a kind of pump protection device. It automatic protects the centrifugal pump when a pump body occurs cavitation damage or unstable (especially conveying hot water at low load operation). Once pump flow is lower than the preset flow, bypass can completely open to ensure the minimum required flow pump. Even running fully closed, the namely the main flow is zero, the minimum flow can also discharge from the bypass.

According to the difference of inductive main flow, the main valve disc check cone of the Automatic recirculation valve will automatically move to a certain position. At the same time the main valve disc drive bypass valve stem, transfer the movement of main valve disc to bypass, through control bypass valve disc position, change bypass throttling area, so as to control bypass flow.

When the main valve disc back into the valve seat closed, all flow backflow through the bypass. When the valve discs to rise to the top position, the bypass is fully closed, all the flow of pump flow to the processing system. This valve set four functions in one body.