air admittance的意思|示意

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Air admittance is a mechanical fitting that allows air to enter a plumbing system, while avoiding negative pressure in the system. It is used in place of traditional vent pipes, which are otherwise necessary to ensure water-tight seals in plumbing systems. Air admittance is an accepted practice in many jurisdictions, and is commonly used in residential and commercial applications, including floor drains, sinks, toilets and washing machines.

Air admittance works by using a valve and a one-way diaphragm to equalize pressure in a plumbing system without allowing any sewer gases to escape into the living space. The valve, which is usually made of PVC, is installed in the wall or ceiling and connected to the plumbing system. When the pressure in the plumbing system drops due to the use of water, the valve allows air to enter to equalize the pressure. When the pressure rises due to the water draining, the valve closes and prevents any sewer gases from escaping.

Air admittance is easy to install in existing or new plumbing systems, and is relatively inexpensive. It is particularly beneficial in situations when traditional vent pipes are impractical, such as in a basement or when plumbing is routed through walls or ceilings. In addition, it eliminates the need for bulky and noisy fans to vent sewer gases.

In conclusion, air admittance is an efficient and cost-effective way to equalize pressure in a plumbing system while providing water-tight seals and eliminating the escape of sewer gases. It is a common practice in many jurisdictions, and can be easily installed in existing or new plumbing applications.