What Is Water Hammer?
Water Hammer is a pressure shock in a plumbing system that happens when flowing water stops or changes direction quickly. The shock travels through pipes and can create banging, knocking, shaking, or movement at pipe supports. It often appears after a valve closes, a washing machine stops, or a faucet shuts suddenly.
Quick Facts About Water Hammer
Category
Plumbing pressure problem
Used for
Diagnosing pipe noise and movement
Common confusion
Often mistaken for a pipe leak
Also called
Hydraulic Shock
Often discussed with
Water Line Repair
Key Takeaways About Water Hammer
- Banging usually follows a sudden change in water flow.
- Loose supports can make the noise and movement more noticeable.
- Water Hammer is not the same as a leaking pipe.
How Water Hammer Works
Water Hammer starts when moving water loses speed or changes direction very quickly. The water pushes against valves, fittings, and pipe walls. That force can send a pressure wave through the water line.
Related glossary terms: Water Pressure, Shutoff Valve, Pressure Reducing Valve.
The pressure wave may cause a sharp bang, repeated knocks, or visible pipe movement. Pipe supports, wall openings, and loose fittings can make the sound louder. A working shutoff valve may still trigger the noise if it closes abruptly.
We check the timing of the sound and the fixtures in use. We also look for pipe movement, loose supports, and pressure concerns. A pressure reducing valve can play a role when supply pressure adds to the problem. The correct repair depends on what starts the pressure change.
Expert Note
When we inspect Water Hammer, we listen for when the noise starts and which fixture caused it. We check exposed water lines, supports, valves, and nearby connections. On water line repair work, we also look for movement that could strain a joint or fitting.
Water Hammer in Practice: A Real-World Example
A washing machine may stop filling and cause a sharp bang behind the wall. During a water line repair, we check whether the line moves, whether supports are loose, and whether the valve closes too quickly.
Related Services
Related Terms
Water Pressure
Water pressure is the force that moves water through supply pipes and plumbing fixtures. Pressure helps…
Shutoff Valve
A shutoff valve is a plumbing control that stops water flow through a pipe or fixture…
Pressure Reducing Valve
A Pressure Reducing Valve is a plumbing control device that lowers incoming water pressure to a…
Pipe Fitting
A pipe fitting is a plumbing component that joins, redirects, extends, reduces, or ends a pipe…
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