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90-AU Pressure Reducing Valve with Secondary Protection

The Cla-Val Pacific Model 90-AU/690-AU Pressure Reducing Valve with secondary protection automatically reduces a higher inlet pressure to a steady lower downstream pressure, regardless of changing flow rate and/or varying inlet pressure. This valve is an accurate, pilot-operated regulator capable of holding downstream pressure to a pre-determined limit. When downstream pressure exceeds the pressure setting of the control pilot, the main valve and pilot valve close drip-tight.  In the event of a primary diaphragm failure, a second diaphragm is automatically brought into service, keeping the valve operational.  Additional protection is provided by a secondary CRD pilot control for automatic transition back-up in the event of primary pilot control failure.