Ballcock

A ballcock (also balltap or float valve) is a mechanism or machine for filling water tanks, such as those found in flush 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, a Mexican priest and scientist, who described the device in 1790 in the Gaceta de Literatura Méxicana.^[1] It consists of a valve connected to a hollow sealed float by means of a lever, mounted near the top of the tank. The float is often ball-shaped, hence the name ballcock. The valve is connected to the incoming water supply, and is opened and closed by the lever which has the float mounted on the end. When the water level rises, the float rises with it; once it rises to a pre-set level, the mechanism forces the lever to close the valve and shut off the water flow. This is an example of negative feedback and of proportional control.

Flapper valve

When a toilet's handle is turned, a discharge mechanism is activated by means of a rod or chain. The mechanism may be a flapper valve, which is designed to sink more slowly than the water, which will exit to the toilet bowl below, so that the tank may empty. As the tank water level drops, the float descends and actuates the fill valve. Water is fed to the tank to replenish its supply, and a smaller flow is directed into the overflow tube to refill the bowl. Once the flapper valve closes, the water flow from the fill valve continues until the tank level again reaches the fill line.

A traditional gravity toilet tank

	The handle is pressed and the flush cycle begins.	The flapper has closed, and the tank refills within seconds.
1. float, 2. fill valve, 3. lift arm, 4. tank fill tube, 5. bowl fill tube, 6. flush valve flapper, 7. overflow tube, 8. flush handle, 9. chain, 10. fill line, 11. fill valve shaft, 12. flush tube Note: These diagrams represent a configuration typical in the USA, mechanisms may vary in other countries .

Syphon valve

Another discharge mechanism, common in the United Kingdom, is a siphon. The rod or chain lifts a piston that pulls an initial charge of water up into the siphon. When the column of water passes over the siphon bend and starts to fall down the exit pipe, the siphon action continues to empty the tank until the water in the tank falls below the siphon intake.

Ballcock valve

Toward the end of the discharge process, the ballcock responds to the drop in water level and refills the tank. Should the float or valve fail and allow the water level to exceed the fill line, the water will pour into the overflow tube and out to the bowl (in the flapper valve type) or to an outside drain (in the siphon type). Although this does not stop the wastage of water, it avoids the flooding that would otherwise occur after a single-point valve failure.

These devices are sold at most hardware, plumbing supply, and home improvement stores.

References

↑ Saladino García, Alberto. El sabio: José Antonio Alzate y Ramírez de Santillana (Toluca, UAEM, 2001), PP. 42-43.

Toilets
Equipment	Automatic toilet paper dispenser Ballcock Bidet Bidet shower Brush Cistern Electronic bidet Flushometer Roll holder Seat Seat cover Self-cleaning toilet bowl Self-cleaning toilet seat Toilet paper Trap (U-bend)
Types	Aircraft Accessible Arborloo Bedpan Blair Board Bucket Cathole Chemical Composting Container-based Dry Dual flush Dunny Flush Freezing Head (boat) Hudo (Scouting) Incinerating Latrine Low-flush Passenger train Pay Pit Pig Portable Public Sanisette (self-cleaning) Space Squat Treebog Unisex public Urine-diverting dry Washlet
Cultural aspects	Adult diaper Bathroom privileges Feminine hygiene Flying toilet Honeywagon Incontinence pad Islamic toilet etiquette Istinja Latrinalia Manual scavenging Outhouse Privatization of public toilets Rest area Scatology Shit Museum Slopping out Toilet (room) Toilet god Toilet humor Toilet paper orientation Toileting Toilet training Toilet-related injuries and deaths Toilets in Japan Toilet Twinning Urinary segregation Washroom attendant
Urine-related aspects	Female urination device Interactive urinal Pissoir Pollee Urination Urinal Urinal (health care) Urine collection device Urine diversion
Feces-related aspects	Anal cleansing Defecation postures Fecal sludge management Open defecation
Historical terms	Aphedron Chamber pot Close stool Commode Garderobe Gong farmer Groom of the stool Pail closet Privy midden Reredorter
See also	History of water supply and sanitation Sanitation Sewage treatment World Toilet Day

External links

Introduction to ballcock valves
US 2837111, Mueller, Paul G., "Ball cock valve mechanism", published 6 January 1955, issued 3 June 1958 ; hysterisis issue. "Such flush tank valves as now commonly used are closed against the pressure of water from a source of supply which pressure opposes the movement of the float under rising water level in the tank. This results in a slow or delayed movement of the valve preliminary to its reaching its fully closed position and accordingly develops an objectionable hissing sound due to the discharge of water through the then slightly open valve under full water pressure; this delayed action continuing until the slowed delivery of water to the tank finally raises the water level to a point where the float will be effective in fully closing the valve. This action of the conventional float controlled valves frequently gives rise to a condition where full closing of the valve does not occur with a consequent continuous leakage of water through the valve with a resulting waste of water."
US 418162, Cahill, W. J., "Ball cock", published 2 October 1889, issued 31 December 1889 ; hysterisis issue.

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