Essential knowledge: how to determine if your pressure relief valve is compromised

A pressure relief valve (PRV), acting as a safety guardian in your plumbing system, plays a pivotal role in safeguarding against excessive pressure buildup. However, even this crucial component can succumb to wear and tear, leaving you wondering, “How to know if your pressure relief valve is bad?” This comprehensive guide will unravel the telltale signs and symptoms that indicate a malfunctioning PRV, empowering you to take proactive measures and maintain a safe and efficient plumbing system.

Signs of a Bad Pressure Relief Valve

1. Frequent Dripping or Leaking

A steady drip or leak emanating from the PRV is a common indication of a faulty valve. This leakage occurs when the valve fails to seal properly, allowing water to escape.

2. No Dripping or Leaking

Conversely, an absence of dripping or leaking can also be a red flag. A fully functional PRV should release a small amount of water occasionally to prevent sediment buildup and ensure proper operation.

3. Water Hammer

Water hammer, a loud banging noise originating from the pipes, can be caused by a malfunctioning PRV. The valve’s inability to release excess pressure leads to sudden pressure surges, resulting in the characteristic banging sound.

4. High Water Pressure

Excessively high water pressure, exceeding the recommended range for your plumbing system, may indicate a faulty PRV. A properly functioning valve should regulate pressure within the safe limits.

5. Corroded or Damaged Valve

Rust, corrosion, or physical damage to the PRV can impair its performance. These issues can hinder the valve’s ability to open and close effectively, compromising its safety function.

6. Old Age

Like any mechanical component, PRVs have a finite lifespan. As they age, they become more susceptible to wear and tear, increasing the likelihood of failure.

7. Improper Installation

Incorrect installation can also lead to a faulty PRV. Improper sizing, inadequate support, or incorrect orientation can compromise the valve’s functionality.

How to Test a Pressure Relief Valve

1. Manual Test

With the water supply turned on, lift the lever or handle on the PRV. A properly functioning valve will release a short burst of water.

2. Pressure Gauge Test

Connect a pressure gauge to the system and observe the pressure reading. If the pressure exceeds the valve’s set point, the valve may be faulty.

Consequences of a Faulty Pressure Relief Valve

Ignoring a malfunctioning PRV can have severe consequences:

• Burst Pipes: Excessive pressure can lead to pipe ruptures, causing extensive water damage.
• Damage to Appliances: High pressure can damage water-using appliances, such as dishwashers and washing machines.
• Injury: A faulty PRV can release scalding water, posing a safety hazard.

Replacing a Faulty Pressure Relief Valve

Replacing a faulty PRV is a task best left to a licensed plumber. However, if you possess the necessary skills and tools, follow these steps:

1. Turn off the water supply.
2. Drain the water from the system.
3. Disconnect the old valve.
4. Install the new valve.
5. Turn on the water supply and check for leaks.

Preventative Maintenance

Regular maintenance can help prevent PRV failure:

• Inspect the Valve: Periodically check the valve for signs of corrosion or damage.
• Operate the Valve: Manually lift the lever or handle occasionally to ensure proper operation.
• Clean the Valve: Remove any sediment or debris that may accumulate on the valve.

What You Need to Know

Q: How often should I replace my pressure relief valve?
A: Every 5-10 years or as recommended by the manufacturer.

Q: Can I use a different type of PRV than the one originally installed?
A: No, it’s crucial to use the same type and size of PRV as the original.

Q: Is it okay to bypass the pressure relief valve?
A: Never bypass the PRV, as it is a critical safety device.