AUTOMATIC RECIRCULATION VALVES

Pump protection valves are required to ensure the minimum flow rate of a pump at all times. This protects the pump against overheating, cavitation and thereby destruction. If the flow through the pump falls below a certain level the bypass system opens and the fluid will be re-circulated providing the required minimum flow for the pump.

Valves work in a modulating way. Should the discharge increase, then the amount of fluid re-circulated by the bypass is automatically reduced and vice versa. This increases the efficiency of the entire system and optimises the economy in the low-load operation.

The pump protection works entirely over the inside valve technology. The volume by which the process decreases is measured independent of the pressure – the amount returned over the bypass is adapted automatically.