Conbraco 10 606 05 Valve Freon the module utilizes a solid state the module utilizes a solid state design with a standard 3 second time delay on decreasing levels to prevent nuisance tripping caused by surface turbulence or boiler surging Hytrel sleeves require different flange types due to their higher torque and lower flexibility characteristics The Conbraco 10 606 05 is a high capacity hot water pressure relief valve engineered specifically for protection against over pressurization in large scale commercial and industrial boiler systems it is recommended to manually lift the test lever periodically to flush out sediment that could compromise the seal