In hydraulic installations in buildings

Currently, a common application of siphons is in the drains of sanitary appliances (sinks, washbasins, toilets, etc.), to prevent the bad smell of putrefactive materials in the sewer from coming out through the drain hole of the appliances. The most classic model (and the one that works best hydraulically) consists of a tube in the shape of an "S" lying down, so that, when draining the device, the water fills the two branches of the tube, up to the drain level of the second, maintaining a plug of clean water that closes the entry of odors.[2]​.

In the toilets, to achieve a complete emptying of the dirty water from the siphon, the cistern is discharged into the bucket, the water fills the first bend of the tube and the second acts as an inverted siphon), sucking the contents of the bucket until the water level drops and some air enters. At this moment, the siphon stops working and the water that is in the ascending part between the two Ss returns, partially filling the first bend of the tube and isolating the drain. of the gases from the pipe. Subsequently, the discharge mechanism must let out a little water, so that the siphon fills up to the drain level of the second branch, as in the previous case.

You can also take the drains from the rest of the bathroom appliances to a common trap, called a "siphon canister" (which is never used in a toilet).

In household appliances

The bleach and softener intake of washing machines is usually an inverted siphon. The softener is in its bucket and does not reach the top of the siphon, but when the water inlet valve is opened, the level rises, beginning the siphoning, which is not interrupted until the softener tank has been emptied.

As a security downloader on channels

Taking advantage of the hydraulic characteristics of inverted siphons, these are more efficient than free weirs to discharge water that, due to some wrong maneuver upstream, could overflow from a channel causing damage to structures, for example, irrigation canals.

When the water level exceeds the maximum allowable level (see figure), the siphon is filled, which begins to discharge until the level drops to what is considered normal, at which time air enters the siphon conduit and is de-primed.

To feed irrigation from a canal

It is a widely used system since an "inverted siphon" allows water to be removed from the tertiary irrigation channel without damaging the channel itself, which is generally made of earth. Modernly, these siphons are usually made of flexible polypropylene (PP), with a diameter of between 50 and 80 mm (2" and 3").

In hydraulic installations in buildings

Currently, a common application of siphons is in the drains of sanitary appliances (sinks, washbasins, toilets, etc.), to prevent the bad smell of putrefactive materials in the sewer from coming out through the drain hole of the appliances. The most classic model (and the one that works best hydraulically) consists of a tube in the shape of an "S" lying down, so that, when draining the device, the water fills the two branches of the tube, up to the drain level of the second, maintaining a plug of clean water that closes the entry of odors.[2]​.

In the toilets, to achieve a complete emptying of the dirty water from the siphon, the cistern is discharged into the bucket, the water fills the first bend of the tube and the second acts as an inverted siphon), sucking the contents of the bucket until the water level drops and some air enters. At this moment, the siphon stops working and the water that is in the ascending part between the two Ss returns, partially filling the first bend of the tube and isolating the drain. of the gases from the pipe. Subsequently, the discharge mechanism must let out a little water, so that the siphon fills up to the drain level of the second branch, as in the previous case.

You can also take the drains from the rest of the bathroom appliances to a common trap, called a "siphon canister" (which is never used in a toilet).

In household appliances

The bleach and softener intake of washing machines is usually an inverted siphon. The softener is in its bucket and does not reach the top of the siphon, but when the water inlet valve is opened, the level rises, beginning the siphoning, which is not interrupted until the softener tank has been emptied.

As a security downloader on channels

Taking advantage of the hydraulic characteristics of inverted siphons, these are more efficient than free weirs to discharge water that, due to some wrong maneuver upstream, could overflow from a channel causing damage to structures, for example, irrigation canals.

When the water level exceeds the maximum allowable level (see figure), the siphon is filled, which begins to discharge until the level drops to what is considered normal, at which time air enters the siphon conduit and is de-primed.

To feed irrigation from a canal

It is a widely used system since an "inverted siphon" allows water to be removed from the tertiary irrigation channel without damaging the channel itself, which is generally made of earth. Modernly, these siphons are usually made of flexible polypropylene (PP), with a diameter of between 50 and 80 mm (2" and 3").