Discover everything you should know about air travel admittance valve ( AAVs ) and how you could instal one yourself to save meter and money .
A common trouble in plumbing remodeling is how to run new vent lines when a structural factor immobilize access to the existingdrain - wasteland - vent-hole system . It might seem like all Leslie Townes Hope is lost , but do n’t rent that minor roadblock get in the agency of yourdream kitchen makeover . One solution is an air admittance valve or AAV . These valves are gravity - function equipment that answer to the minus pressure of draining water and open to let tune in . Then gravity closes the valve , keep sewer gas out of the elbow room . depend on the valve and the size of the outlet , AAVs can support one or multiplevent line . However , before you begin installing an air admittance valve , hold back with your local construction inspection function , as local code govern the consumption of AAVs in place of vents .
BHG / Michela Buttignol
Credit: Jay Wilde
What You’ll Need
Equipment / Tools
Materials
Instructions
Understand How Air Admittance Valves Work
Before you install one , it ’s significant to realize how AAVs work . Air admission valve are operated by somberness . When water and thriftlessness move down a drain line , it create damaging air pressure in the tube . This negative pressure lifts the sealing washer and lets tune in , which allow the waste to drain away freely .
When the negative pressure ceases , the seal washer falls back in place . Earlier translation of this gadget were bound - operated . Such units are still usable but are unreliable and do n’t forgather code in most areas .
Determine Placement
Air admittance valve are typically placed between the atomic number 15 - gob of a fixture and the waste pipe furrow . They ’re usually mounted on one pegleg of a sanitary tee , with the other branch expire to the waste pipe . The unit must be place perlocal codesand the manufacturer ’s education .
Install PVC Drain Line
set up the PVC drain line , the healthful tee , and the P - trap for the sink . The appropriate coupling for the AAV ( glue or threaded ) attache case to the teeing ground . Check the manufacturer ’s command and local codes to determine the right meridian for the AAV above the drain .
Attach Air Admittance Valve
look on the type of meet , glue or be intimate the AAV in seat . see to the manufacturer ’s guidance if you need extra assist .
Check Work
Depending on local codes and the AAV modelling , the complete installation should look like this . AAVs must always be installed vertically and should be unobstructed from items under the sink .
Credit:BHG / Michela Buttignol
Credit: Illustration by Art Rep Services, Inc.
