Will a non-return valve stop water hammer?
Can a Non‑Return Valve Stop Water Hammer?
Water hammer is a serious issue in many piping and pumping systems. It causes loud banging noises, vibrations, and in some cases, pipe damage or failure. If you’ve experienced water hammer, you’ll know how disruptive—and costly—it can be.
But can a non-return valve (NRV) help prevent water hammer? The answer is yes—but only if you choose the right type of valve. Let’s take a look at two of the most common options.
What Is a Non‑Return Valve?
Non-return valves, also known as check valves, are designed to let fluids flow in one direction only. They automatically prevent backflow, protecting pumps and other equipment from damage. These valves are used across a wide range of industries—from food and drink to water treatment and pharmaceuticals.
However, not all non-return valves are suitable for stopping water hammer.
Option 1: Swing-Type Non-Return Valve
❌ May Cause or Worsen Water Hammer
A swing-type NRV has a hinged disc that swings open with the flow and slams shut when the flow reverses. While this design works well in many low-pressure systems, it’s not ideal for preventing water hammer.
Because the disc slams shut suddenly, it can create the pressure surge that causes water hammer in the first place.
In short: Swing-type NRVs can make water hammer worse, not stop it.
Option 2: Spring-Loaded In-Line NRV
✅ Designed to Prevent Water Hammer
A much better solution is a spring-loaded in-line non-return valve (also known as a silent or non-slam check valve). These valves use a spring to control the closing action, so the valve shuts gently and before reverse flow occurs.
This smooth, cushioned closure eliminates the sudden pressure surge that causes water hammer.
Key benefits:
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Quiet, non-slam operation
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Stops water hammer effectively
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Ideal for use with pumps and in hygienic processes
BM Engineering’s Recommended Solution: INOXPA 72700
At BM Engineering Supplies, we supply the INOXPA 72700 spring-loaded non-return valve, which is specifically designed to prevent water hammer and maintain pump prime.
This valve is:
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Made from stainless steel for hygienic use
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Available with Tri-Clamp or DIN fittings
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Designed for food, beverage, chemical, and pharmaceutical industries
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Proven to reduce water hammer and protect your system
👉 Browse our full range of non-return valves
Comparison at a Glance
| Valve Type | Prevents Water Hammer? | Recommended Use Case |
|---|---|---|
| Swing-Type NRV | ❌ No | Low-risk, low-pressure systems |
| Spring-Loaded In-Line NRV | ✅ Yes | Pump lines, high-speed flows, hygiene systems |
Conclusion
Water hammer is more than just a noise—it’s a warning sign of stress in your system. Choosing the wrong non-return valve, such as a swing-type model, can make the problem worse. But by installing a spring-loaded in-line NRV, like the INOXPA 72700 available from BM Engineering, you can effectively stop water hammer before it starts.
Contact Us Today
Call: 0141 762 0657
Email: sales@bmengineering.co.uk
Website: www.bmengineering.co.uk
