water hammer effect

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Water hammer effect: Definition of water hammer. Water hammer occurs when there is a sudden power outage or when a valve is closed too quickly; due to the inertia of the pressurized water flow, shock waves are generated, similar to the impact of a hammer, which is why it is called water hammer. The force generated by the back-and-forth movement of water flow shock waves can sometimes be very large, thereby damaging valves and pumps. 　　“The \"water hammer effect\" refers to the situation inside a water pipe, where the inner wall is smooth and water flows freely. When an open valve suddenly closes, the water flow exerts pressure on the valve and the pipe walls, with the valve being the main target of this pressure. Due to the smooth wall of the pipe, the subsequent water flow, driven by inertia, quickly reaches its maximum velocity and causes destructive effects; this is what is known in hydraulic engineering as the \"water hammer effect\", or positive water hammer. This factor must be taken into account in the construction of water supply pipelines. On the contrary, when a closed valve is suddenly opened, water hammer occurs as well; this is known as negative water hammer, and it also has a certain degree of destructive power, though less than that of the former. 　　When a motorized water pump starts under voltage, it can accelerate from a stationary state to its rated speed in less than 1 second, while the flow rate in the pipeline increases from zero to the rated value. Due to the momentum of the fluid and its degree of compressibility, sudden changes in flow rate can cause pressure surges or drops within the pipeline, as well as cavitation phenomena. The impact of pressure exerts force on the pipe wall, generating noise, similar to a hammer hitting the pipe; this is known as the \"water hammer effect\". Definition of water hammer: Water hammer occurs when there is a sudden power outage or when a valve is closed too quickly; due to the inertia of the pressurized water flow, shock waves are generated, similar to the impact of a hammer, which is why it is called water hammer. The force generated by the back-and-forth movement of water flow shock waves can sometimes be very large, thereby damaging valves and pumps. 　　“The \"water hammer effect\" refers to the situation inside a water pipe, where the inner wall is smooth and water flows freely. When an open valve suddenly closes, the water flow exerts pressure on the valve and the pipe walls, with the valve being the main target of this pressure. Due to the smooth wall of the pipe, the subsequent water flow, driven by inertia, quickly reaches its maximum velocity and causes destructive effects; this is what is known in hydraulic engineering as the \"water hammer effect\", or positive water hammer. This factor must be taken into account in the construction of water supply pipelines. On the contrary, when a closed valve is suddenly opened, water hammer occurs as well; this is known as negative water hammer, and it also has a certain degree of destructive power, though less than that of the former. 　　When a motorized water pump starts under voltage, it can accelerate from a stationary state to its rated speed in less than 1 second, while the flow rate in the pipeline increases from zero to the rated value. Due to the momentum of the fluid and its degree of compressibility, sudden changes in flow rate can cause pressure surges or drops within the pipeline, as well as cavitation phenomena. The impact of pressure exerts force on the pipe wall, generating noise, similar to a hammer hitting the pipe; this is known as the \"water hammer effect\". 　　The water hammer effect is related only to the inertia of water itself, and has nothing to do with pumps. The hazards of the water hammer effect: It is highly destructive; excessive pressure can cause pipes to rupture, while insufficient pressure can lead to pipes collapsing. It can also damage valves and other fixing elements. 　　When the power is cut off and the system stops, the potential energy of the pump water system will overcome the inertia of the motor, causing the system to stop abruptly; this too can lead to pressure surges and water hammer effects. 　　To eliminate the severe consequences of the water hammer effect, a series of buffering measures and devices are required in pipelines. Water hammer arrestors can effectively eliminate the irregular shock wave oscillations caused by water hammer and surges that may occur in fluid transmission systems, without having to stop the flow of fluids. In this way, they help to eliminate destructive shock waves and provide protection. 　　The interior of the water hammer suppressor contains a sealed air chamber, with a piston at its lower end. When a shock wave reaches the water hammer suppressor, the water hammer force acts on the piston, causing it to move toward the air chamber. The stroke of the piston is related to the gas pressure in the gas chamber and the magnitude of the water hammer waves. Under the combined effect of gas at a certain pressure and irregular water hammer forces, the piston moves up and down, achieving a dynamic equilibrium that effectively eliminates the oscillations caused by irregular water hammer waves