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2. Atmospheric vacuum breaker - Wikipedia

   en.wikipedia.org/wiki/Atmospheric_vacuum_breaker

   If the pressure in the "upstream side" is reduced to atmospheric pressure or below, the poppet valve drops and allows air to enter the system, breaking the siphon. [1] One-Inch Brass Atmospheric Vacuum Breaker mounted on PVC Pipe. These devices, since they work on atmospheric principles, cannot be installed in an enclosure containing air ...

3. Vacuum breaker - Wikipedia

   en.wikipedia.org/wiki/Vacuum_breaker

   Pressure type vacuum breakers are similar to atmospheric vacuum breakers but have a spring-loaded check valve to allow operation of under pressure for long periods of time. Spill-resistant vacuum breakers utilize a check valve and air vent inlet that allows air to enter before the internal check valve opens, thereby preventing water spillage ...

4. Backflow prevention device - Wikipedia

   en.wikipedia.org/wiki/Backflow_prevention_device

   Atmospheric vacuum breaker (AVB) Check valve (usually not a legally approved method of backflow prevention.) Chemigation valve (primarily used in agriculture) Double check valve assembly (DCVA) Dual check valve (A dual check is not a testable device and is mainly used on residential customers) Pressure vacuum breaker assembly (PVB)

5. Pressure vacuum breaker - Wikipedia

   en.wikipedia.org/wiki/Pressure_vacuum_breaker

   A pressure vacuum breaker (PVB) is a type of backflow prevention device, used to keep non-potable (or contaminated) water from entering the water supply. A PVB is similar to an atmospheric vacuum breaker (AVB), except that the PVB contains a spring-loaded poppet. This makes it acceptable for applications that are high hazard or where valves are ...

6. Paschen's law - Wikipedia

   en.wikipedia.org/wiki/Paschen's_law

   Early vacuum experimenters found a rather surprising behavior. An arc would sometimes take place in a long irregular path rather than at the minimal distance between the electrodes. For example, in air, at a pressure of one atmosphere, the distance for minimal breakdown voltage is about 7.5 μm. The voltage required to arc this distance is 327 ...

7. Reduced pressure zone device - Wikipedia

   en.wikipedia.org/wiki/Reduced_pressure_zone_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 may also be known as reduced pressure principle (RP), reduced pressure principle backflow prevention devices, [1] [2] reduced pressure zone assemblies (RPZA), [3] or reduced pressure principle ...

8. Really This Is The Only Dish You Should Make With ... - AOL

   www.aol.com/really-only-dish-leftover-turkey...

   Best stock to buy right now: Uber vs. Lyft. Food. Food. Southern Living. Why Southerners will always love a simple mayonnaise sandwich. Food. Simply Recipes.

9. Manifold vacuum - Wikipedia

   en.wikipedia.org/wiki/Manifold_vacuum

   Manifold vacuum, or engine vacuum in a petrol engine is the difference in air pressure between the engine's intake manifold and Earth's atmosphere. Manifold vacuum is an effect of a piston's movement on the induction stroke and the airflow through a throttle in the intake manifold of an engine. It is a measure of the amount of restriction of ...