Air Admittance Valves (AAVs), also known as Sure Vents or quick vents, are one-way mechanical valves designed to provide proper venting for plumbing fixtures without requiring connection to a larger venting system. This document details the installation process for Oatey AAVs, based on provided installation guides. The information presented is intended for U.S. consumers, DIY enthusiasts, and plumbing professionals.
Understanding Air Admittance Valves
An AAV functions by allowing air to enter the drain line to equalize pressure, preventing trap siphonage and ensuring proper drainage. They are installed locally at the plumbing fixture site. The documentation references additional resources for a more in-depth understanding of AAVs, including Oatey 101: Understanding Air Admittance Valves and 3 Things You Should Know about Air Admittance Valves.
Pre-Installation Considerations
Prior to installation, it is crucial to verify local plumbing codes to ensure AAVs are permitted for use in the specific application. The AAV should be installed in a location that meets the following criteria:
- Within the maximum developed length permitted for the vent.
- A minimum of 4 inches above the horizontal branch drain.
- 6 inches above any insulation material.
- Within 15 degrees of vertical.
- Must be accessible for inspection and service.
Installation Steps
The installation process involves several steps, requiring specific tools and materials. The following outlines the procedure based on the provided documentation.
Step 1: Confirm Local Code and Identify Installation Spot
The first step involves confirming that the use of an AAV is approved by the local municipality. Once approval is obtained, identify a suitable installation location adhering to the criteria outlined above.
Step 2: Remove Protective Film
Remove the protective plastic film from the AAV before proceeding with installation.
Step 3: Measure Installation Spot from Branch
Ensure the AAV will be positioned a minimum of 4 inches above the horizontal branch it serves. AAVs must be installed vertically.
Step 4: Measure and Cut Pipe
Measure and cut the pipe using a plastic pipe cutter. It is essential to chamfer and deburr the cut end of the pipe to ensure a strong, leak-proof connection.
Step 5: Attach Pipe to the Adaptor
Solvent weld the cut pipe into the provided adaptor. The documentation specifies different cement and cleaner requirements based on the pipe material:
- ABS: Use Oatey® ABS Medium-Bodied Black Cement and Oatey® Clear Cleaner.
- PVC: Use Oatey® Regular Clear PVC Cement and Oatey® Purple Primer.
Step 6: Install AAV into Adaptor
Wrap thread tape around the AAV and install it into the adaptor by rotating it clockwise around the male threads.
Step 7: Check for Leaks
After installation, thoroughly check for leaks. If the AAV is installed under a sink, fill the sink with water to test for any leaks around the connections.
Determining AAV Functionality
The documentation provides two methods for verifying that an AAV is functioning correctly:
- Shake Test: Remove the valve and shake it vigorously. A properly functioning AAV will produce a rattling sound from the diaphragm. The absence of noise may indicate a failed AAV.
- Sewer Gas Detection: The presence of sewer gas odor is another indication that the AAV has failed in the open position.
Important Considerations
- AAVs must be installed vertically and remain accessible for inspection and service.
- Directional fittings should be used when installing drains and AAV extensions.
- Proper solvent welding techniques are crucial for creating a watertight seal. Ensure the pipe is properly prepared (chamfered and deburred) and the correct cement and cleaner are used for the pipe material.
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Conclusion
Oatey Air Admittance Valves offer a convenient solution for plumbing venting, particularly in situations where a traditional vent stack is impractical. Successful installation requires careful adherence to local plumbing codes, precise measurements, and proper solvent welding techniques. Regular inspection, utilizing the shake test or monitoring for sewer gas odors, is essential to ensure continued functionality and prevent potential plumbing issues.