Determining Pressure Rating

• Consult manufacturer documentation: Datasheets, manuals, or the valve's nameplate usually state the pressure rating, often referencing standards like ANSI B16.34 (specifying classes such as 150, 300, 600 psi) or API 6D.
• Check material specifications: The valve body material (carbon steel, stainless steel, brass) directly impacts pressure capacity. For instance, stainless steel valves often handle higher pressures than brass ones of the same size.
• Account for temperature effects: Pressure ratings decrease at elevated temperatures due to material weakening. Use manufacturer-provided temperature-pressure charts to adjust the rating for your operating conditions.
• Evaluate the actuator's limits: Pneumatic actuators have a maximum air supply pressure (usually 80-100 psi). Ensure the actuator can generate enough force to operate the valve under the system's working pressure.
• Align with system requirements: The valve's rating must exceed or match the system's maximum operating pressure to ensure safety. Verify compliance with industry standards (ISO, DIN) through pressure testing records (hydrostatic or pneumatic) to confirm rating validity.