Durgo Valve Problems

Durgo valves, commonly known as air admittance valves (AAVs), are widely used in modern plumbing systems. They allow air to enter the drainage system to balance the pressure, ensuring that the system operates efficiently. When working properly, they prevent unwanted sewer gases from escaping into the home. However, some homeowners have encountered problems with these valves. Here’s a breakdown of some common issues with potential solutions:

1. Drainage Issues:

Problem: Slow drainage from showers and toilets, gurgling noises, and potential airlock formation.

Solution: The immediate improvement upon removing the cap from the AAV suggests it might not be functioning as it should. Here are some steps to take:

• Check for blockages in the drainage system.
• Inspect manholes for any signs of water build-up or blockages.
• If removing the AAV cap resolves the issue temporarily, consider replacing the AAV.

2. Air Admittance Valve (AAV) Functionality:

Problem: The AAV doesn’t seem to have moving parts, and there’s uncertainty about its functionality or potential failure.

Solution:

• The AAV functions by letting in fresh air and stopping drain smells from exiting. If the AAV seems to be sticking or malfunctioning, replacing it might be a solution. They aren’t typically expensive, making it a reasonable first step in troubleshooting.
• If a blockage isn’t the issue, consider venting the AAV to the outside.
• You could also conduct a simple test by covering the open pipe with a bin liner and flushing the toilet. If the liner moves upward, it indicates a blockage or obstruction in the drain.

3. Blockage in the Drainage System:

Problem: Slow moving water in the manhole, a build-up of ‘dirty’ water, and gurgling noises.

Solution:

• For small manholes, consider investing in a modern drain rod kit with a flexible pipe. This can be used to dislodge any blockages.
• A professional drain jetting service might also be required if traditional methods don’t work. This service uses high-pressure water to clear obstructions.

4. Installation and Orientation of the AAV:

Problem: Uncertainty regarding the orientation of the AAV, particularly the rubber part.

Solution:

• It’s crucial to ensure the AAV is installed correctly. If there are doubts about the orientation of certain parts, consult the installation guide or seek advice from a professional plumber.

In summary, while the Durgo valve or AAV is a vital component in modern plumbing systems, like all parts, it can experience issues. Regular inspections and early troubleshooting can prevent major problems in the long run. If in doubt, always consult with a professional to ensure the safety and functionality of your plumbing system.