Large butterfly valves are generally mechanically operated for which of the following reasons?

Large butterfly valves are generally mechanically operated for which of the following reasons?

• A. To enhance precision in flow regulation
• B. To prevent the valve from slamming shut due to flow through the valve
• C. To reduce the manual effort required for operation
• D. To improve the sealing ability

Answer: (B)

Large butterfly valves are typically mechanically operated primarily to prevent the valve from slamming shut due to flow through the valve. When these valves are used in systems where flow rates can be substantial, a sudden closure could generate significant pressure surges, commonly referred to as water hammer. This phenomenon can lead to mechanical failures or damage both to the valve itself and to the piping system. By utilizing mechanical operation, the valve can be controlled more gradually, minimizing abrupt movements and allowing for a smoother transition in valve position, which helps in managing flow rates more effectively and prevents sudden shutoff. Mechanical operation also aids in ensuring that the valve can manage larger forces encountered in high-flow conditions, further reinforcing safety and operational reliability.

Large butterfly valves are typically mechanically operated primarily to prevent the valve from slamming shut due to flow through the valve. When these valves are used in systems where flow rates can be substantial, a sudden closure could generate significant pressure surges, commonly referred to as water hammer. This phenomenon can lead to mechanical failures or damage both to the valve itself and to the piping system. By utilizing mechanical operation, the valve can be controlled more gradually, minimizing abrupt movements and allowing for a smoother transition in valve position, which helps in managing flow rates more effectively and prevents sudden shutoff.

Mechanical operation also aids in ensuring that the valve can manage larger forces encountered in high-flow conditions, further reinforcing safety and operational reliability.