Air Admittance Valves  

Step by step instructions on installing an air admittance valve... 

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Air admittance valves installation.

 

The loop vent is accepted by code in any jurisdiction and is a reliable method to vent your island sink.

However in many areas of the country, you will find another option that may be far simpler, the air admittance valve (AAV). The AAV let the necessary amount of air enter a DWV system when water is draining, but they seal after the line has emptied to keep sewer gases from escaping. The advantage of AAV is that you can install them to vent individual fixtures, reducing the total amount of vent piping needed, as well as the quantity of roof penetrations. You can also install them on branch vent lines to service multiple fixture. Any vent system containing AAV also must have at least one standard vent outlet to the outside from the building. In AAV, the valve is opened by negative line pressure from the drain line created by flushing or draining. As soon as the valve opens, the pressure in the line equalizes.

 

 

 

AAV can be installed into PVC system like any other solvent glued fitting.

 

Air admittance valves are intended to permit air into the vent system when needed, but to hold it from exiting when the system should remain closed.

 

  

 

 

    Common Air admittance valves applications.

 

 

 

1.By installing an air admittance valves in a plumbed kitchen island, it is possible to do away with almost all of the complex loop vent plumbing.

 

 

2. An AAV attached to the trap of a single plumbing fixture can eliminate great quantities of plumbing labor. An AAV can be installed on the branch drain servicing as numerous as six fixtures so long as the DWV system has 1  outlet from your roof and outdoors of your building.

 

 

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