Overview: The document provides technical specifications and details for Series 2856 Pressure Relief Valves, designed for air, steam, vapor, and liquid services. These valves are built in conformance with ASME Code Section VIII and are capacity certified by the National Board for air, gas, and steam.

Specifications: The valves have set pressures up to 300 psig and are constructed with a brass body and trim, and a bronze bonnet. The materials used include ASTM B16 H.H. Brass, SB-62 Bronze, and 316 Stainless Steel for various components.

Bill of Materials: Key components include the body, bonnet, disc, blow down ring, cap, stem, spring adjustment screw, jam nut, spring buttons, cap gasket, grooved pin, wire/lead seal, and spring, primarily made from brass and stainless steel.

Performance and Capacities: The document provides detailed capacity tables for water, steam, and air, indicating the flow rates at various set pressures. For example, at 100 psig, the steam capacity for a 2-inch valve is 6082 pounds per hour.

Selection Table: The selection table lists valve sizes and corresponding maximum set and back pressures. It also notes that a test lever is required for air, steam, or hot water service above 140°F (60°C).

General Notes: The document includes notes on valve type numbers, maximum set pressures for steam service, and suitability for liquid service where ASME Code certification is not required.

Dimensions and Weights: The document provides dimensions and approximate weights for different inlet sizes, ranging from 3/4 x 1 1/4 inches to 2 x 3 inches.

Additional Information: The document emphasizes that while the information is presented in good faith, Farris Engineering does not guarantee satisfactory results from reliance on the information provided. The company reserves the right to alter or improve product designs or specifications without notice.