How does a plumbing air admittance valve work?

Air admittance valves are operated by gravity. When water and waste move down a drain line, it creates negative air pressure in the pipe. This negative pressure lifts the sealing washer and lets air in, which allows the waste to drain away freely.

What happens when an air admittance valve fails?

Air Admittance Valves (AAV) are one-way vents installed after the trap on the drain line of a fixture. Failure to bring air back into the pipes can result in a vacuum (causing slow draining and gurgling), or even the siphoning of water out of traps (allowing sewer gases to enter the home through drain openings).

What is the vent pipe connected to?

Common Types of Plumbing Vents Pipes It’s a vertical pipe attached to your drain line. Because no water runs through it, it vents from the roof. Common vent: Use a common vent between two fixtures installed on opposite sides of a wall, like back-to-back sinks. They’re connected to the stack with a sanitary cross.

Can an air admittance valve be boxed in?

Where an AAV is enclosed in a boxing the boxing should be ventilated. The use of ventilation grilles, discreet gaps around the boxing or ventilation of the boxing into a ventilated roof void are some acceptable methods of providing ventilation.

How do you know if an air admittance valve is working?

If you happen to notice that your air admittance valve is acting like it is not sucking up what it should, then you may have a hole or two on your hands. Sometimes you may find that even with an air admittance valve, there are still clogs and a sewer odor. While this is rare, it is possible.

Do cheater valves go bad?

They are however overused so if you can put a traditional vent in it is best to do because the studor vent does not last forever and they do go bad and need replacement from time to time.

What kind of vent is an air admittance valve?

Air Admittance Valves (AAV) Sometimes we can’t (or don’t want to) vent through the roof line. In these rare cases plumbers use an Air Admittance Valve. Air Admittance Valves (aka Studor vents) are “negative-pressure-activated” one-way mechanical valves.

Where to buy air admittance valves at Home Depot?

Air Admittance Valves – Valves – The Home Depot Get free shipping on qualified Air Admittance Valves or Buy Online Pick Up in Store today in the Plumbing Department. #1 Home Improvement Retailer Store Finder Truck & Tool Rental For the Pro Gift Cards

What causes the air admittance valve to open?

A discharge of wastewater down your sink drain causes a valve on the AAV to open. When it opens air is allowed to enter the plumbing system. Watch this video to help understand how a plumbing vent works.

Where can I get a Studor air admittance valve?

Save up to $100♢ on your qualifying purchase. Curbside pickup available. STUDOR, INC is the distributor of the STUDOR brand of Air Admittance Valves (AAVs) for the plumbing industry in the USA, Canada, Mexico and Puerto Rico.