A brass gas ball valve is a type of valve specifically designed for controlling the flow of gas in gas pipelines or systems. It is commonly used in residential, commercial, and industrial applications where gas needs to be shut off or regulated. Here are some key features and characteristics of a brass gas ball valve:

1. Material: A brass gas ball valve is typically made of brass, a durable and corrosion-resistant material. Brass is commonly used in gas applications because of its ability to withstand high-pressure and high-temperature environments.

2. Ball Valve Design: The valve is designed in a ball valve configuration, which consists of a spherical ball with a hole in the middle. When the valve handle is turned, the ball rotates within the valve body, allowing or restricting the flow of gas.

3. Quarter-Turn Operation: Brass gas ball valves usually operate on a quarter-turn principle, meaning that the valve handle only needs to be turned 90 degrees (a quarter of a full revolution) to fully open or close the valve. This design provides quick and easy control over the gas flow.

4. Full Port or Standard Port: Brass gas ball valves are available in full port or standard port configurations. A full port valve has a larger ball and opening, allowing for maximum flow capacity. A standard port valve has a smaller ball and opening, which may slightly restrict the flow but can be more cost-effective.

5. Threaded or Flanged Connections: Brass gas ball valves can have threaded or flanged connections, depending on the specific application and installation requirements. Threaded valves have male or female threads that allow for direct connection to pipes or fittings. Flanged valves have flanges that can be bolted to compatible flange connections.

6. Lever Handle: The valve is typically operated by a lever handle attached to the valve stem. The lever handle provides leverage for easy turning and controlling of the valve.

7. Gas Compatibility: Brass gas ball valves are designed to handle various types of gases, including natural gas, propane, butane, and other similar gases commonly used in residential and commercial applications.

8. Safety Features: Some brass gas ball valves may include safety features such as a built-in safety locking mechanism or a visual indication of the valve position (open or closed) to enhance safety and prevent accidental operation.

When selecting a brass gas ball valve, consider factors such as the valve size, pressure rating, gas compatibility, and installation requirements. It's important to choose a valve that is appropriate for the specific gas application and complies with relevant safety standards and regulations in your region. Additionally, professional installation and regular maintenance are essential to ensure the safe and efficient operation of the valve.