Q: Every time I turn off the water faucet in my laundry room, it sounds like someone is banging on the wall. Is my house possessed by evil spirits? Please help. The noise is frightening my kids. A: ...

Hydraulic transients, most notably water hammer, represent critical phenomena in fluid transmission systems, involving rapid pressure fluctuations triggered by the sudden opening or closure of valves ...

Water hammer is a dangerous hydraulic shockwave caused when fast-moving water in pipes is suddenly stopped, often by quickly closing a valve. This sudden momentum change generates a spike in pressure ...

In other words, water hammer arresters are now required -- they are no longer a mere suggestion. You'll most commonly find "quick-acting valves" on dishwashers and clothes washing machines. Also, the ...