Ball Valves

Ball valves are a type of valve used in water and wastewater treatment plants to control the flow of fluids. They consist of a spherical disc, the ball, which has a hole through the middle. When the valve is in the open position, the hole is in line with the flow and allows passage. When the valve is closed, the hole is perpendicular to the flow, blocking it. Ball valves are known for their durability and effective shutoff capability.

• Pump discharge and suction
• Sludge handling
• Chlorine feed systems
• Thickener underflow applications

• Routine operation tasks include opening and closing the valve as necessary for system operation.
• Typical maintenance procedures include periodic checking for leaks and occasional replacement of worn seats or seals.
• Important safety considerations include ensuring that the valve is not opened or closed too quickly, which could cause water hammer.

• Ball: The ball is the central component that allows or restricts flow. It is typically made from stainless steel or brass.
• Seats: These create a seal when the valve is closed. They are often made from resilient materials like PTFE.
• Stem: The stem connects the handle to the ball. It is important to select a stem material that can withstand the process fluid.
• Handle: The handle is used to control the valve. It should be sized to allow easy operation.

• Flow rate (gpm or L/s): The valve must be sized to accommodate the maximum flow rate of the system.
• Pressure (psi): The valve materials and design must be able to withstand the maximum system pressure.
• Temperature: The materials must be suitable for the maximum fluid temperature.

• MasterFormat Division 40 (Process Integration), Section 41 36 13 (Ball Valves)

• NIBCO: T-585-70
• Flowserve: FKB Series
• Mueller Water Products: B-20200 Series

• Gate valves: These are also used for shutting off flow, but are less suitable for throttling applications. They may be preferred for larger pipe sizes due to their lower cost.
• Butterfly valves: These are suitable for throttling applications and offer a compact design. They may be preferred for applications where space is limited.