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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
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
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
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)
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)
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
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
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
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
Physiologic phenomenon
has been proposed as one driver of aldosterone escape, as Starling force backflow of Na+ and water into the tubules thus favors Na+ excretion. Normally,
Aldosterone_escape
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
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)
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 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
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
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
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
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
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 by
Reverse_(2017_TV_series)
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
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
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
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
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
Backflow prevention device
A backwater valve is a backflow prevention device used to prevent outbound water through a dwelling's drain pipes from re-entering -- "back flowing"—into
Backwater_valve
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
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
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
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
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
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
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
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
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
1933 world's fair in Chicago, Illinois, US
19, 2017. Retrieved January 19, 2017. "2022 National Backflow Prevention Day!". Arbiter Backflow. August 16, 2022. Archived from the original on March
Century_of_Progress
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
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
Turbofan jet engine
Lean TAPS combustor reduces NOx gases with required pressure loss and backflow margin. Fan blades have steel alloy leading edges and the composite fan
General_Electric_GEnx
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
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
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)
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
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
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
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
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
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
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
World_Plumbing_Council
Adding fertilizers to an irrigation system
potable (drinking) water supply, a backflow prevention device is required for most fertigation systems. Backflow requirements may vary greatly. Therefore
Fertigation
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
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
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
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
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
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
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
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Sewage_pumping
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
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
Valve closed by squeezing a tube
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Pinch_valve
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
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
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
Device that cools air through the evaporation of water
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Evaporative_cooler
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)
Major river in northern France
residential and industrial sewage is discharged into the Seine to prevent backflow. This is due in large part to Paris's "single system" drainage scheme dating
Seine
British nurse convicted of murder (born 1990)
and drainage problems that caused blocked pipes and occasional sewage backflow in sinks, issues that had been raised by the defence at trial. Aviv also
Lucy_Letby
Medical condition
significance. Defects may be due to narrowing of one or more valves (stenosis), backflow of blood, through a leaky valve (regurgitation), or the presence of abnormal
Heart_murmur
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
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
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
Nuclear site in Cumbria, England
transfer vessel and backflow trap. Unexpectedly, 2.15 kg (4.7 lb) of plutonium had accumulated in the transfer vessel and backflow trap and become just
Sellafield
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
Connecting pieces in pipe systems
Because of the dual connection, it must be designed to resist the accidental backflow of contaminated water. A combination tee (combo tee, combo wye, tee-wye
Piping_and_plumbing_fitting
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
Species of true bug
excess of sperm. The proximal region contains valves which prevent the backflow of sperm when muscles dilate. This region is connected to the spermathecal
Harlequin_cabbage_bug
Valves or loops of pipe on water heaters
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Heat_trap
Semi-solid tissue in the spongy portions of bones
Furthermore, bone marrow performs a valve-like function to prevent the backflow of lymphatic fluid in the lymphatic system.[citation needed] Biological
Bone_marrow
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
Valve in the heart connecting the left atrium and left ventricle
prolapse can result in mitral insufficiency, which is the regurgitation or backflow of blood from the left ventricle to the left atrium due to the incomplete
Mitral_valve
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
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
Kenya's largest freshwater wetland
which is fed by the floodwaters of the Nzoia and Yala rivers and by the backflow of water from Lake Victoria. The wetland is in Siaya and Busia counties
Yala_Swamp
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
Plumbing fixture
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Floor_drain
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
Genetics on the peopling of the Americas
to exist as 'genetic ghosts'. Genetic studies also show Amerindian-like backflow into present Siberian groups, especially those from the Kamchatka Peninsula
Genetic history of the Indigenous peoples of the Americas
Genetic_history_of_the_Indigenous_peoples_of_the_Americas
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)
Type of amusement ride
barricaded to prevent boats from bottle-necking or getting caught in a backflow, and a planned whirlpool effect was scrapped. Many modern river rapids
River_rapids_ride
Syrup made from the sap of maple trees
the University of Vermont unveiled a new type of tap that prevents sap backflow into the tree, thereby reducing bacterial contamination and discouraging
Maple_syrup
Africa had a more recent East African origin, as a result of "the first M1 backflow [from Asia] to Africa, dated around 30,000 [years ago]". The study states
Genetic_history_of_Egypt
Tradesperson specializing in water and sewage systems
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Plumber
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
Arteries of the penis
pools in the corpora cavernosa, resulting in erection. The valves prevent backflow in the now-tortuous route through the cavernosa. This parasympathetic relaxation
Helicine_arteries_of_penis
Place in which a person bathes under a spray of water
v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss
Shower
Type of Soviet nuclear power reactor
reactor power is below 500 MWt. Each pump has a flow control valve and a backflow preventing check valve on the outlet, and shutoff valves on both inlet
RBMK
River in Sha Tin, Hong Kong
is still threatened by the polluted condition of Tolo Harbour, which backflows into the Shing Mun River during high tide, causing contamination. An artificial
Shing_Mun_River
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Boy/Male
Contemporary
Blend of Ray and Shawn.
Male
English
People's Victory
Boy/Male
Indian, Sanskrit
Sparrow
Boy/Male
Tamil
Prahlad | பà¯à®°à®¹à®²à®¾à®¤
Excess of Joy
Girl/Female
Indian, Telugu
Brave and Beautiful
Biblical
portion of the LORD; the LORD is my portion
Boy/Male
Arabic, Muslim
God will Hear
Boy/Male
Tamil
Shashvata | ஷாஷà¯à®µà®¤
A name of Lord Rama eternal
Boy/Male
Tamil
Earth
Girl/Female
Tamil
God is gracious, Superior person
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