Relief Device Accessories

The various types of relief devices can be equipped with accessories that may be required when the device is used in certain applications. Some of the most frequently encountered accessories are:
• Lifting lever. Pressure relief valves in contact with certain service fluids are required by Section VIII of the ASME Boiler and Pressure Vessel Code to be equipped with a lifting lever to facilitate periodic in-place testing of the valve’s freedom of movement. These fluids are water at temperatures above 140 °F, air, and steam.
• Open bonnet. Pressure relief valves in steam service (particularly within the scope of ASME Boiler and Pressure Vessel Code Section I) are generally equipped with open bonnets (i.e., the spring and spindle are exposed).

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