What is the pressure rating for a cast iron gate valve?

The pressure rating for a cast iron gate valve can vary based on the specific type and design of the valve, as well as the manufacturer. However, typical pressure ratings for cast iron gate valves are as follows:

Typical Pressure Ratings:

1. Class 125:

   - Pressure Rating: Up to 200 psi (pounds per square inch) for non-shock cold water, oil, or gas services.

   - Temperature Range: Typically up to 120°F for water and steam services.

   - Usage: Commonly used in general service applications such as water distribution and waste treatment.

2. Class 250:

   - Pressure Rating: Up to 500 psi for non-shock cold water, oil, or gas services.

   - Temperature Range: Typically up to 150°F for water and steam services.

   - Usage: Used in higher pressure systems, such as industrial and commercial water systems.

Factors Influencing Pressure Ratings:

- Design Standards: The pressure rating can depend on the standards to which the valve is manufactured, such as ANSI, ASTM, or other relevant standards.

- Material Quality: The quality of the cast iron material and the valve's construction can affect its pressure rating.

- Valve Size: Larger valves might have different pressure ratings compared to smaller ones due to the structural differences.

Manufacturer Specifications:

Different Gate valve manufacturers may have variations in their specific models, so it is always recommended to check the manufacturer's datasheet or specifications for the exact pressure rating of a particular cast iron gate valve model.

Applications:

- Water Supply Systems: Often used in municipal water systems due to their durability and sufficient pressure ratings.

- HVAC Systems: Used in heating, ventilation, and air conditioning systems for controlling the flow of water and steam.

- Industrial Applications: Suitable for a variety of industrial processes involving non-corrosive fluids.

Conclusion:

The pressure rating of cast iron gate valves generally ranges from 200 psi for Class 125 to 500 psi for Class 250, with specific ratings dependent on the valve's design, material, and manufacturing standards. Always refer to the specific manufacturer's documentation to ensure the gate valve meets the required specifications for your application.