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Air admittance valves (AAVs, or commonly referred to in the UK as Durgo valves and in the US as Studor vents and Sure-Vent®) are negative-pressure-activated, one-way mechanical valves, used in a plumbing or drainage venting system to eliminate the need for conventional pipe venting and roof penetrations.
A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. [1] Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various ...
Leaf valve: one-way valve consisting of a diagonal obstruction with an opening covered by a hinged flap; Line blind valve: a thin sheet oriented perpendicular to the pipe. The sheet has a solid end and a flow-through end; sliding it from one position to the other opens or stops the flow. Also called sliding blind valve
Non-return or check valves allow the free flow of a fluid in one direction but prevent its flow in a reverse direction. They are often seen in drainage or sewage systems but may also be used in pressurized systems. Valves are available in several types, based on design and purpose: Gate, plug, or ball valves – Isolation; Globe valve ...
Vacuum breakers can be used in sewage applications as an alternative to a water seal. It utilizes a one-way membrane that acts similar to a check valve. The membrane is sensitive enough to open under the weight of four ounces of water but remains closed when no water is present above to minimize evaporation and eliminate sewer gas odors. [4]
Heimlich valve: The flutter valve functions by allowing only outwards airflow from the body of the patient. Photo depicting a Heimlich valve. The construction of the flutter valve enables it to function as a one-way valve allowing airflow, or the flow of a fluid, in only one direction along the drainage tube.