Experiencing reduced water flow or inconsistent pressure from your mixer tap can be frustrating, especially when it seems to be a simple issue. One common cause of this problem is an airlock, which occurs when trapped air blocks the flow of water within the pipes or the tap itself. Fortunately, fixing an airlock is usually straightforward and can often be done with basic tools and some patience. In this guide, we’ll walk you through the steps to identify and eliminate an airlock from your mixer tap, restoring smooth water flow and ensuring your plumbing functions properly.
How to Fix an Airlock in a Mixer Tap
Understanding What an Airlock Is
An airlock in your plumbing occurs when air becomes trapped in the pipes or the tap’s mechanisms, preventing water from flowing freely. This is often caused by changes in water pressure, recent plumbing work, or even fluctuations in municipal water supply. Common signs of an airlock include:
- Weak or no water flow from the tap
- Gurgling sounds when the tap is turned on
- Uneven water pressure or intermittent flow
Recognizing these symptoms is the first step in diagnosing an airlock and differentiating it from other plumbing issues such as blockages or faulty valves.
Tools and Materials Needed
Before you begin, gather the following tools and materials:
- Adjustable spanner or wrench
- Screwdriver (flat-head and Phillips)
- Bucket or basin
- Cloth or rag
- Rubber gloves (optional)
- Plumber’s tape (if needed for reassembly)
- Bleed valve or tap key (if available)
Having these ready will streamline the process and make the task less cumbersome.
Step-by-Step Guide to Fixing an Airlock
1. Turn Off the Water Supply
Start by shutting off the mains water supply to prevent water from flowing while you work. Locate the stopcock under the sink or near your water meter and turn it clockwise until fully closed. This step is crucial for your safety and to prevent water damage during the repair process.
2. Open the Tap to Drain Remaining Water
Once the water supply is off, turn on the mixer tap to release any residual water in the pipes. This will also help to identify if the problem is isolated to the tap or involves the entire plumbing system.
3. Inspect the Tap for Visible Blockages or Damage
Use a screwdriver to remove the tap handle and any decorative covers, exposing the internal mechanisms. Check for visible signs of damage, debris, or mineral buildup. Clean the parts gently with a cloth and remove any dirt or buildup.
4. Check the Cartridge or Valve Assembly
Many mixer taps operate with a cartridge or valve assembly that can trap air. Carefully remove the cartridge using an adjustable spanner or screwdriver, following the manufacturer’s instructions. Once removed, inspect it for blockages or debris.
5. Bleed the Air from the System
This is the critical step to eliminate the airlock. There are a few methods depending on your tap type:
- Using a Bleed Valve (if available): Open the bleed valve slightly with a wrench or screwdriver to let trapped air escape. Keep a bucket underneath to catch any water or air release. Then, close it once water flows steadily.
- Manual Purge Method: With the tap still disassembled, turn on the mains water supply slowly while holding the tap open. This allows water to push out trapped air. Be cautious to avoid water splashing.
- Using a Pump or Squeeze Technique: Attach a manual pump or use a bicycle pump to the inlet pipe (if accessible) to force water through and displace the air.
6. Reassemble the Tap and Turn On the Water
Once the air has been expelled, reassemble the cartridge or valve assembly carefully, ensuring all parts are correctly positioned and secured. Turn the stopcock back on slowly to restore water flow. Check for leaks and ensure water flows smoothly from the tap.
7. Test the Water Flow
Open the mixer tap fully and observe the water flow. If the flow has returned to normal and is steady, the airlock has been successfully cleared. If not, repeat the bleeding process or consider checking other parts of your plumbing system.
Additional Tips and Troubleshooting
- Persistent Airlocks: If you repeatedly experience airlocks, it may indicate a more significant problem such as leaks, pipe damage, or high water pressure. Consider consulting a professional plumber for a comprehensive inspection.
- Mineral Buildup: Mineral deposits from hard water can cause blockages that mimic airlocks. Regular cleaning of the cartridge and internal parts can prevent this issue.
- Check Water Pressure: Extremely high or low water pressure can cause airlocks. Use a pressure gauge to monitor and adjust your system if necessary.
- Use of Anti-Airlock Devices: Some modern plumbing systems incorporate air-release valves or anti-airlock devices that help prevent this issue. Installing such devices can save time and effort in the future.
Summary of Key Points
Fixing an airlock in a mixer tap involves shutting off the water supply, disassembling the tap to access the internal parts, and carefully bleeding out trapped air. Ensuring all parts are clean and correctly reassembled is vital for a successful repair. Regular maintenance, such as cleaning cartridge components and monitoring water pressure, can prevent future airlocks. If problems persist despite these efforts, seeking professional plumbing assistance is advisable to diagnose potential underlying issues. With patience and proper technique, you can restore your mixer tap to optimal performance and enjoy consistent water flow once again.
