What Is Water Hammer?
Water hammer is a pressure shock that occurs when moving water stops or changes direction suddenly. The shock travels through pipes and can create a banging or knocking sound. Repeated pressure shocks may loosen pipe supports, strain valves, or damage plumbing connections. Water hammer often points to a flow-control problem.
Quick Facts About Water Hammer
Category
Plumbing pressure problem
Used for
Diagnosing pipe noise and flow shocks
Common confusion
High water pressure
Also called
Hydraulic Shock, Water shock
Often discussed with
Water Pressure Repair
Key Takeaways About Water Hammer
- The sound comes from a sudden change in water flow.
- Loose supports and faulty valves can make the noise worse.
- Water hammer isn't the same as high water pressure.
How Water Hammer Works
Water hammer starts when water moves through a pipe and a valve closes quickly. The moving water has nowhere to go, so pressure travels back through the pipe. The pipe may shake, and nearby fixtures can produce a sharp bang.
Related glossary terms: Pressure Reducing Valve, Water Pressure Gauge, Expansion Tank.
Plumbers check the sound, the fixture that triggers it, and the condition of the supply piping. A pressure reducing valve can affect the system if it does not control pressure properly. A worn shutoff valve can also stop flow too quickly.
Repair work may include securing loose pipes, adjusting or replacing a valve, or adding a water hammer arrestor. An expansion tank can help with pressure changes in some closed plumbing systems. The right repair depends on where the noise starts and how the water moves through the system.
Expert Note
When we inspect water hammer, we identify which fixture starts the noise and check nearby valves and pipe supports. We also check water pressure and look for movement in exposed piping. That helps us separate a flow shock from ordinary loose-pipe noise.
Water Hammer in Practice: A Real-World Example
A washing machine valve may close quickly and cause a bang in the nearby supply line. For a Water Pressure Repair visit in Maple Valley, we would trace the noise, check the valve and supports, and determine whether pressure control contributes to the problem.
Related Services
Related Terms
Pressure Reducing Valve
A Pressure Reducing Valve is a plumbing control that lowers incoming water pressure to a safer…
Water Pressure Gauge
A water pressure gauge is a testing tool that shows the force of water inside a…
Expansion Tank
An expansion tank is a small pressure-control vessel connected to a closed hot-water system. It gives…
Shutoff Valve
A Shutoff Valve is a plumbing control that stops or allows water flow through a pipe…
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