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Unwanted reverse flow of water
Backflow is a term in plumbing for an unwanted flow of water in the reverse direction. It can be a serious health risk for the contamination of potable
Backflow
Device that prevents undesired water flow
A backflow prevention device is used to protect potable water supplies from contamination or pollution due to backflow. In water distribution systems,
Backflow_prevention_device
Pre-Neolithic and Neolithic human migration events
"Eurasian backflow" or "Eurasian back-migrations" refers to several waves of early modern-human migrations before and during the Neolithic, when some groups
Eurasian_backflow
Backflow prevention device
A reduced pressure zone device (RPZD, RPZ, or RPZ valve) is a type of backflow prevention device used to protect water supplies from contamination. RPZDs
Reduced_pressure_zone_device
One-way valve present between right auricle and right ventricle
atrium to the right ventricle during diastole, and to close to prevent backflow (regurgitation) from the right ventricle into the right atrium during right
Tricuspid_valve
Type of blood flow
the heart or between heart chambers. It is the circulatory equivalent of backflow in engineered systems. It is sometimes called reflux. The various types
Regurgitation_(circulation)
2017 South Korean television series
Reverse Promotional poster Also known as Backflow Flow Back Hangul 역류 RR Yeongnyu MR Yŏngnyu Genre Family Melodrama Revenge Created by Choi Yong-won Written
Reverse_(2017_TV_series)
Valve controlling the release of a liquid or gas
hose spigots, hose bibs, and wall hydrants to have a vacuum breaker or backflow preventer, so that water cannot return through the spigot from the hose
Tap_(valve)
Mechanism for filling water tanks
toilets, while avoiding overflow and (in the event of low water pressure) backflow. The modern ballcock was invented by José Antonio de Alzate y Ramírez,
Ballcock
Backflow prevention device
A backwater valve or a backflow valve is a backflow prevention device used to prevent outbound water through a dwelling's drain pipes from re-entering
Backwater_valve
Water supplied through a pipe and tap combination
minimum is an air gap. See cross connection control & backflow prevention for an overview of backflow prevention methods and devices currently in use, both
Tap_water
Blood vessels that carry blood towards the heart
blood is maintained by one-way (unidirectional) venous valves to prevent backflow. In the lower limbs this is also aided by muscle pumps, also known as venous
Vein
practice, is an arrangement of pipes formed into a vertical loop to prevent backflow of water within the plumbing potable water system. Since a siphon has a
Hydrostatic_loop
Type of check valve
commonly used in medical applications to prevent contamination due to backflow. One end of the valve is stretched over the outlet of a supply line, conforming
Duckbill_valve
Flow control device
regardless of flow direction or pressure. In addition to closing in response to backflow or insufficient forward pressure (normal check-valve behavior), it can
Check_valve
Noise generated by the heart
may also occur with valvular insufficiency (regurgitation), which allows backflow of blood when the incompetent valve closes with only partial effectiveness
Heart_sounds
Thermodynamic process that uses energy sources to heat water
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Water_heating
Chemical mixture for unblocking plumbing drains
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Drain_cleaner
Backflow prevention device to protect water supply from contaminants
A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. It is different
Double_check_valve
Flap of tissue that prevent backflow of blood around the heart
to allow blood flow and which then close together to seal and prevent backflow. The mitral valve has two cusps, whereas the others have three. There are
Heart_valve
Infrastructure that conveys sewage or surface runoff using sewers
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Sewerage
Waterproof receptacle for holding liquids, usually water
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Cistern
Device involving the flow of liquids through tubes
non-potable fluid, the water supply shall be protected against backflow by a backflow preventer. Where a hose bibb is installed outside a building, inside
Siphon
Medical condition
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Scalding
Organ found in humans and other animals
blood flows one way through the heart due to heart valves, which prevent backflow. The heart is enclosed in a protective sac, the pericardium, which also
Heart
Inflammation of the esophagus
many causes. GERD is the most common cause of esophagitis because of the backflow of acid from the stomach, which can irritate the lining of the esophagus
Esophagitis
Sometimes called a check valve or a backflow preventer, a chemigation valve is an apparatus designed to protect water supplies from agricultural chemicals
Chemigation_valve
Organ system for circulating blood in animals
veins into the coronary sinus and from this one into the right atrium. Backflow of blood through its opening during atrial systole is prevented by the
Circulatory_system
Lake in Iberia Parish, Louisiana, US
from the Gulf of Mexico to flow into what was now an empty lakebed. This backflow created for a few days the tallest waterfall in Louisiana, at 164 ft (50 m)
Lake_Peigneur
Connection point by which firefighters can tap into a water supply
a clapper valve (if not designed into the hydrant already) to prevent backflow into the hydrant. Additionally, residents who wish to use the hydrant to
Fire_hydrant
Backflow prevention device
An atmospheric vacuum breaker (AVB) is a backflow prevention device used in plumbing to prevent backflow of non-potable liquids into the drinking water
Atmospheric_vacuum_breaker
Vertical space between water outlet and flood level
form of backflow prevention. A common use of the term "air gap" in domestic plumbing refers to a specialized fixture that provides backflow prevention
Air_gap_(plumbing)
Medical condition
incompetent and allows backflow from the pulmonary artery to the right ventricle of the heart during diastole. While a small amount of backflow may occur ordinarily
Pulmonary_regurgitation
Medical device
the valve function, thereby opening up the ureter to backflow. The main risk of such a backflow is the spreading of a urinary tract infection up into
Ureteral_stent
Flexible tube used to convey water
drinkable water supply, the spigot or tap should be fitted with an approved backflow prevention device, to prevent contaminated water from being siphoned back
Garden_hose
Hood-shaped covering used to increase the draft of a chimney and prevent backflow
hood-shaped covering used to increase the draft of a chimney and prevent backflow. The cowl, usually made of galvanized iron, is fitted to the chimney pot
Cowl_(chimney)
Dilated veins in the anus
Anorectal varices are collateral submucosal blood vessels dilated by backflow in the veins of the rectum. Typically this occurs due to portal hypertension
Anorectal_varices
Water that has been used and contaminated
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Wastewater
Cocktail
vinegar, fruit juice, or wine or for a fitting or tubing installed between a backflow prevention device and a carbonator." The FDA's Model Food Code specifically
Moscow_mule
Bathroom plumbing fixture
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Bidet
Common material used as sealant or filler
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Putty
Tool to clear blockages in drains and pipes
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Plunger
Aggregate quarry located in Thornton, Illinois
Thornton Quarry and McCook Quarry will serve as reservoirs to reduce the backflow of stormwater and sewage from Chicago area rivers into Lake Michigan. Thornton
Thornton_Quarry
Backflow prevention device
outside air) and preventing backflow of water. A more complex valve that accomplishes much the same purpose is the backflow preventer. Vacuum relief valves
Vacuum_breaker
Tarred fiber
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Oakum
Water safe for consumption
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Drinking_water
Class of animals with milk-producing glands
ensures blood flows in the correct direction through the heart (preventing backflow). After gas exchange in the pulmonary capillaries (blood vessels in the
Mammal
Detection of leaks in pipelines
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Leak_detection
Plumbing company
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Roto-Rooter
Type of check valve
to enter the chamber. The reeds close when the flow stops, preventing backflow. Leaf valves are commonly mounted in the intake port of most 2-stroke motorcycle
Leaf_valve
Device that shreds food waste for disposal via plumbing
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Garbage_disposal_unit
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
World_Plumbing_Council
Flow-control device
valve", a type of check valve that uses a solid ball to prevent undesired backflow. Other types of quarter-turn valves include the butterfly valve and plug
Ball_valve
Equipment used to seal walls of bore holes
isolation is obtained. Float Shoes and Collars (float valves) prevent backflow after the cement has been pumped into place. Devices fitted with hinged
Cementing_equipment
Arrangement and function of the components of regulators for underwater diving
component, or burn up a significant part of the equipment and surroundings. Backflow of water into a scuba regulator can occur if the supply pressure drops
Mechanism of diving regulators
Mechanism_of_diving_regulators
Association of American plumbing manufacturers
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Plumbing_&_Drainage_Institute
Gases produced and collected in sewer systems
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Sewer_gas
River in Kenya
experiences annual floods at the flat and swampy lower end due to the backflow of Lake Victoria. This leads to perennial humanitarian crisis in the Budalangi
Nzoia_River
Underwater diving in a known hazardous materials environment
diving equipment is breathing gas exhaust systems that minimise the risk of backflow of contamination through the exhaust valves into the helmet. Most of these
Hazmat_diving
Electronic device
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Water_detector
Historic spring in Florida, United States
Backflow from Peace River after hurricanes
Kissingen_Springs
Tool to dislodge clogs in plumbing
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Plumber's_snake
Systems for conveying fluids
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Plumbing
Safety valve used to control or limit the pressure in a system
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Relief_valve
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Sewage_pumping
Sewage overflow prevention fitting
reduce the risk of property damage and health hazards. Sanitary sewer Backflow prevention device Sanitary sewer overflow "Check your overflow relief gully
Overflow_relief_gully
Final section of the small intestine
of the ileal opening as a result of engorgement, the ileum prevents the backflow of ingesta and the equalization of pressure between jejunum and the base
Ileum
Type of floor drain
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Trench_drain
Plumbing device
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Trap_(plumbing)
Capital city of Maryland, United States
adaptation plan including seawall repair, door dams, doorway barriers, backflow preventers in storm drain systems, and elevated building entrances. After
Annapolis,_Maryland
Type of valve with a small port
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Needle_valve
Backwards flow of urine from the bladder into the ureters and kidneys
one-way valve at the vesicoureteral (ureteral-bladder) junction preventing backflow. The valve is formed by oblique tunneling of the distal ureter through
Vesicoureteral_reflux
Flow control device
maintain a seal against bi-directional pressure differential to prevent any backflow in systems designed for unidirectional flow. It accomplishes this with
Butterfly_valve
Type of sanitary fixture for urination
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Urinal
Type of water- of steam-flow valve
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Zone_valve
Flow control device
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Valve
Fitting used in plumbing and piping
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Nipple_(plumbing)
Fountain designed to provide drinking water
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Drinking_fountain
Thermodynamic device that uses energy to raise the temperature of water
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Storage_water_heater
Underground pipe for transporting sewage
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Sanitary_sewer
Condition in which a male has abnormally low semen volume
Structural or functional damage to the bladder neck muscle causes the backflow of semen during the ejaculation.[medical citation needed] Nerve damage
Hypospermia
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
List_of_tools_and_equipment
Mass extinction event about 66 million years ago
J. (2005). "Basinward transport of Chicxulub ejecta by tsunami-induced backflow, La Popa basin, northeastern Mexico, and its implications for distribution
Cretaceous–Paleogene extinction event
Cretaceous–Paleogene_extinction_event
Model plumbing safety code
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Uniform_Plumbing_Code
Flow control device
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Gate_valve
Bowl-shaped plumbing fixture
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Sink
Equipment which allows the user to breathe at hypoxic altitudes
was a non-rebreather mask which had a single non-return valve to prevent backflow into the reservoir bag which accumulated oxygen from a constant flow regulator
High-altitude breathing apparatus
High-altitude_breathing_apparatus
Oil platform destroyed by explosion and fire in 1988
main oil pipeline shutdown valve on Piper was leaking, thus allowing a backflow of oil into the fire. Coincidentally, Silver Pit was also the standby vessel
Piper_Alpha
Pressure surge when a fluid is forced to stop or change direction suddenly
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Hydraulic_shock
Air purifier design
corners of the box fan to improve the system's efficiency by reducing backflow. The units can be assembled in around 15 minutes, last for months, and
Corsi–Rosenthal_Box
Type of pump
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Sump_pump
Tubular section or hollow cylinder
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Pipe_(fluid_conveyance)
1984 gas-leak accident in Bhopal, India
10 feet (3.0 m) that would have been necessary to enable the water to "backflow" into the MIC tank. A key intermediate valve would have had to be open
Bhopal_disaster
Injury due to pressure difference between gas filled space and adjoining tissue
bar. The non-return valve at the connection to the helmet will prevent backflow if it is working correctly, but if absent, as in the early days of helmet
Barotrauma
Device that removes impurities in water
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Water_filter
Water tower on the roof of a tall building
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Rooftop_water_tower
Plumbing device
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Grease_trap
Automobile variable valve timing technology
idling, while accelerated timing of the intake valve's closing reduces backflow to improve volumetric efficiency, which helps increase engine output as
MIVEC
Type of cutaneous condition
prevented by using compression stockings to prevent blood pooling and backflow. It is likely that a person who has had a skin ulcer will have it again;
Ulcer_(dermatology)
Valve that blends hot water and cold water
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Thermostatic_mixing_valve
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