Overview: The document provides technical specifications and details for Series 2850 Pressure Relief Valves, designed for air, steam, vapor, and liquid service. These valves are built in accordance with ASME Code Section VIII and are certified by the National Board for air, gas, and steam services.

Specifications: The valves have set pressures up to 300 psig and are constructed with stainless steel body and trim. They are available in various sizes with different inlet and outlet configurations. The materials used include SA-479 Type 316 Stainless Steel and SA-351 Gr. CF8M Stainless Steel, among others.

Materials and Construction: The document lists the bill of materials for the valves, including components such as the body, bonnet, disc, blow down ring, and various screws and nuts, all primarily made from stainless steel or carbon steel.

Temperature and Pressure Ratings: The valves are suitable for a temperature range from -20°F to +750°F (-28.9°C to +399°C). For high-temperature applications, specific modifications are required, such as changing the spring material to chrome alloy.

Performance and Capacity: The document includes capacity tables for water, steam, and air, detailing the flow rates at various set pressures and overpressure conditions. For example, at a set pressure of 100 psig, the steam capacity for a 3/4 x 1 valve is 1004 pounds per hour.

Installation and Usage Notes: The document provides guidance on selecting the appropriate valve type for different services, such as using a test lever for air, steam, or hot water service above 140°F (60°C).

Dimensions and Weights: The document includes dimensions and approximate weights for the valves, facilitating installation planning.

General Notes: The document advises on modifications for high-temperature applications and provides information on the coefficients of discharge for sizing purposes.

Disclaimer: Farris Engineering provides a disclaimer regarding the accuracy and reliability of the information, stating that specifications may change without notice.