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V526 Pressure Relief Control Valve is hydraulically operated safety control valves, designed to protect water network systems by releasing higher upstream pressure surges to atmosphere that causes from sudden changes in water speed because pumps put into/out of service frequently in water network elevation lines or for any reasons. When line pressure goes beyond preset point, the valve opens by itself quickly and protects system by releasing over pressure and maintains it constant, regardless of fluctuating demand or varying upstream pressure. When there is no flow in the system, it closes by itself automatically. When line pressure decreases to normal level, it closes slowly and automatically as fully sealed without causing surge.