Siphon
The word siphon (Greek: Σιφών also spelled syphon) is sometimes used to
refer to a wide variety of devices that involve the flow of liquids through
tubes. The word siphon usually refers to a tube in an inverted U shape which
causes a liquid to flow uphill, above the surface of the reservoir, without
pumps, powered by the fall of the liquid as it flows down the tube under the
pull of gravity, and is discharged at a level lower than the surface of the
reservoir. In practical siphons, atmospheric pressure pushes the liquid up the
tube into the region of reduced pressure at the top of the tube. The reduced
pressure is caused by liquid falling on the exit side.
Types of Siphon
1)
Inverted
siphon
An inverted
siphon is not a siphon but a term applied to pipes that must dip below
an obstruction to form a "U" shaped flow path. Inverted
siphons are commonly called traps for their function in preventing
smelly sewer gases from coming back out of drains and sometimes making
dense objects like rings and electronic components retrievable after falling
into a drain.
2)
Back siphon:
Back siphon is a
plumbing term applied to clean water pipes that connect directly into a
reservoir without an air gap. As water is delivered to other areas of the
plumbing system at a lower level, the siphon effect will tend to siphon water
back out of the reservoir. This may result in contamination of the water in the
pipes. Back siphon is not to be confused with backflow. Back siphonage is a
result of liquids at a lower level drawing water from a higher level. Backflow
is driven entirely by pressure in the reservoir itself. Backflow cannot occur
through an intermediate high-point. Back siphonage can flow through an
intermediate high-point and is thus much more difficult to guard against.
3)
Bottle siphon:
4)
Bowl siphon:
5)
Siphon barometer:
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