What type of valve is used to reduce water hammer?

To reduce water hammer, the blow-off valve or pressure relief valve is the most effective choice. Water hammer is a phenomenon that occurs when the flow of fluid in a pipe is suddenly stopped or changed, leading to a shock wave and resulting in a loud banging noise. This can cause damage to pipes and fixtures over time.

A blow-off valve or pressure relief valve helps mitigate this effect by allowing excess pressure to escape from the system, thereby reducing the hydraulic shock. When sudden changes in flow occur, such as when a tap is turned off quickly, this valve can open to relieve pressure and prevent the violent pressure fluctuations that contribute to water hammer.

The other types of valves listed have different functions. A gate valve is primarily used for on/off control and does not provide the necessary response to quick pressure changes. A check valve is designed to prevent backflow and does not mitigate water hammer. A ball valve operates effectively in controlling flow but does not specifically address the issues created by water hammer. These features distinguish the blow-off valve or pressure relief valve as the most suitable solution for minimizing water hammer.