Overview: This document is a technical catalog for the Series 1890 pressure relief valves by Farris Engineering, designed for air, steam, vapor, and liquid services. It includes specifications, material details, and capacity tables for different service conditions.

Specifications: The valves are suitable for high-temperature ranges from -20°F to +750°F (-28.9°C to +399°C). For temperatures above 401°F (205°C), the type number changes, and the spring material is upgraded to chrome alloy. The valves are built in conformance with ASME Code Section VIII and have a maximum set pressure of 800 psig.

Materials: The body is made of 316 stainless steel, while the bonnet and cap are carbon steel. Other components like the disc, guide, and stem are also stainless steel, ensuring durability and resistance to corrosion.

Valve Selection: The selection table provides details on valve sizes, inlet and outlet connections, and maximum set pressures. The valves are available with plain screwed caps or packed levers, depending on the service requirements.

Capacity Tables: The document includes capacity tables for water, steam, and air services under 10% overpressure conditions. Capacities are provided in gallons per minute for water, pounds per hour for steam, and standard cubic feet per minute for air.

Notes: The document provides additional notes on discharge coefficients for sizing purposes and adjustments for overpressure conditions. It also includes a bill of materials listing all components and their materials.

Disclaimer: Farris Engineering provides this information in good faith but does not guarantee results. The company reserves the right to alter designs or specifications without notice.