The function of a Rupture Disc is to protect against accidental overpressure of a pressure vessel due to system malfunction or fire. A Rupture Disc is generally used in combination with a Henry Technologies?Pressure Relief Valve. Applications: A Rupture Disc protects against any leakage or weeping of refrigerant through a relief valve. A rupture disc can also be used in combination with a pressure gauge and/or pressure switch to detect if a relief valve has discharged. Henry Technologies? Rupture Discs are designed to operate with gases and should not be used to prevent liquid over-pressure. The 55 Series brass Rupture Discs are suitable for use with HCFC and HFC refrigerants and their associated oils, as well as other industrial fluids noncorrosive to brass, silver and nickel. The 56 Series stainless steel Rupture Discs are suitable for use with Ammonia, HCFC and HFC refrigerants and their associated oils, as well as other industrial fluids non-corrosive to steel, silver and nickel. It is recommended that all high side Rupture Discs should be replaced at least every 2 years. All low side discs should be replaced at least every 5 years. These intervals may have to be reduced if other regulations apply How it works A foil disc is clamped in a holder. The disc is designed to burst at a predetermined pressure - the set pressure. A reverse acting disc is used. This means that the disc is domed against the direction of the fluid pressure and designed to buckle due to compression forces, prior to bursting. Advantages of a reverse acting disc include being less sensitive to temperature, high operating pressures and improved fatigue life. Each disc is manufactured with a precision score mark. This score mark in combination with the buckling action causes the disc to burst. At burst, the disc is designed to hinge resulting in a large available flow area. The disc is designed to be nonfragmenting after rupturing. Main Features Proven safe design High flow capacity Compact Reverse acting, non-fragmenting disc 2X 1/8 NPT gauge ports Helium leak tested Non-standard pressure settings available on request