Shower valve troubleshooting: does your valve need a hammer arrestor?

If you’ve ever experienced a loud banging noise in your pipes when you turn on the shower, you’ve encountered water hammer. This phenomenon can be both annoying and potentially damaging to your plumbing system. One way to mitigate water hammer is to install a hammer arrester on your shower valve. But does every shower valve need one? Let’s explore this topic in detail.

Understanding Water Hammer

Water hammer occurs when water flowing through a pipe is suddenly stopped or redirected. This sudden change in water velocity creates a pressure surge that travels through the pipes, causing them to vibrate and bang against surrounding structures.

Causes of Water Hammer in Shower Valves

There are several factors that can contribute to water hammer in shower valves:

• Sudden closing of the valve: When you quickly turn off the shower, the water flowing through the valve is abruptly stopped, creating a pressure surge.
• Long pipe runs: The longer the distance between the valve and the fixture, the greater the potential for water hammer.
• Insufficient air cushioning: Air pockets in the pipes can act as cushions, absorbing pressure surges and reducing water hammer.

Benefits of Installing a Hammer Arrester

A hammer arrester is a device installed on the shower valve that helps to absorb pressure surges and reduce water hammer. It typically consists of a chamber filled with air or water that serves as a cushion for the sudden changes in water velocity.

The benefits of installing a hammer arrester on a shower valve include:

• Reduced noise: A hammer arrester can significantly reduce the loud banging noise associated with water hammer.
• Protection of plumbing fixtures: Water hammer can damage shower valves, faucets, and pipes. A hammer arrester helps to protect these fixtures from excessive wear and tear.
• Improved water flow: By eliminating pressure surges, a hammer arrester can improve the flow of water from the showerhead.

Types of Hammer Arresters

There are two main types of hammer arresters used for shower valves:

• In-line hammer arresters: These are installed directly on the water line leading to the shower valve.
• Point-of-use hammer arresters: These are installed directly on the shower valve itself.

Choosing the Right Hammer Arrester

When choosing a hammer arrester for your shower valve, consider the following factors:

• Size: The hammer arrester should be sized appropriately for the water flow rate of your shower.
• Type: In-line hammer arresters are more effective for long pipe runs, while point-of-use hammer arresters are suitable for shorter runs.
• Cost: Hammer arresters vary in price depending on the type and size.

Installation Considerations

Installing a hammer arrester on a shower valve is a relatively simple task that can be completed by a DIY enthusiast with basic plumbing skills. However, it’s important to follow the manufacturer’s instructions carefully to ensure proper installation.

Maintenance and Troubleshooting

Hammer arresters require minimal maintenance. However, it’s a good idea to inspect them periodically for leaks or damage. If you notice any issues, contact a qualified plumber for assistance.

Questions You May Have

Q: Do all shower valves need a hammer arrester?
A: Not necessarily. If you don’t experience water hammer in your shower, a hammer arrester may not be necessary. However, it’s recommended for showers with long pipe runs or those that are prone to water hammer.

Q: Can I install a hammer arrester myself?
A: Yes, installing a hammer arrester on a shower valve is a relatively easy task for a DIY enthusiast with basic plumbing skills.

Q: What are the signs of a faulty hammer arrester?
A: Signs of a faulty hammer arrester include continuous banging noises in the pipes, reduced water flow, and leaks around the arrester.