How To Match The Pressure of Floating Flange Ball Valves Ranging From PN16 To PN100 with Your System Pressure

Understanding Floating Flanged Ball Valves

Floating flanged ball valves are a type of ball valve designed with a floating ball mechanism. The ball can move slightly within the valve body, providing better sealing performance and compensating for any misalignment in the piping system. These valves are widely used in industries such as oil and gas, chemical processing, water treatment, and more. They are known for their durability, reliability, and ability to handle high pressures and temperatures.

Key Components of Floating Flanged Ball Valves

• Valve Body: The main structure that houses all internal components.

• Floating Ball: The spherical element that controls the flow of fluid. It can move slightly within the valve body to maintain contact with the seals.

• Seats: The sealing elements that provide a tight seal against the ball.

• Stem: The component that connects the ball to the external actuator or handle.

• Flanges: The connection points that allow the valve to be bolted to the piping system.

Pressure Ratings: PN16 to PN100

The pressure rating of a valve indicates the maximum pressure it can safely withstand at a specified temperature. Floating flanged ball valves are available in various pressure ratings, commonly denoted as PN (Nominal Pressure) ratings. The PN ratings range from PN16 to PN100, with each rating corresponding to a specific maximum allowable working pressure (MAWP).

Common PN Ratings and Their Corresponding MAWP

• PN16: Maximum Allowable Working Pressure (MAWP) of 16 bar (232 psi)

• PN25: MAWP of 25 bar (363 psi)

• PN40: MAWP of 40 bar (580 psi)

• PN64: MAWP of 64 bar (928 psi)

• PN100: MAWP of 100 bar (1450 psi)

Matching Valve Pressure to System Pressure

To ensure the safe and efficient operation of your system, it is crucial to select a floating flanged ball valve with a pressure rating that matches or exceeds the system's operating pressure. Here are some steps to help you make the right selection:

1. Determine System Operating Pressure

The first step is to identify the maximum operating pressure of your system. This information can typically be found in the system's design documentation or by consulting with the system designer. Ensure that you consider any pressure surges or spikes that may occur during operation.

2. Select the Appropriate PN Rating

Once you have determined the system's operating pressure, select a floating flanged ball valve with a PN rating that is equal to or higher than the system's maximum operating pressure. For example, if your system operates at a maximum pressure of 30 bar, a valve with a PN40 rating (40 bar MAWP) would be suitable.

3. Consider Safety Factors

It is generally recommended to select a valve with a PN rating that provides a safety margin above the system's operating pressure. This ensures that the valve can handle any unexpected pressure surges without compromising safety. A common practice is to select a valve with a PN rating that is at least 20% higher than the system's maximum operating pressure.

4. Verify Temperature Compatibility

In addition to pressure, it is essential to ensure that the valve material and seals are compatible with the operating temperature of your system. Different materials have varying temperature ranges, so it is crucial to select a valve that can withstand the system's operating temperature.