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2. Automatic bleeding valve - Wikipedia

   en.wikipedia.org/wiki/Automatic_bleeding_valve

   The valves are normally installed with the first installation of a system, then remain in place for the life of the system. They are generally reliable and require no maintenance. If they do eventually fail, they are replaced rather than repaired. A leaking valve commonly shows a dribble of water from the air vent, or stains of rust or limescale.

3. Nozzle and flapper - Wikipedia

   en.wikipedia.org/wiki/Nozzle_and_flapper

   The nozzle and flapper mechanism is a displacement type detector which converts mechanical movement into a pressure signal by covering the opening of a nozzle with a flat plate called the flapper. [1] This restricts fluid flow through the nozzle and generates a pressure signal.

4. Infiltration (HVAC) - Wikipedia

   en.wikipedia.org/wiki/Infiltration_(HVAC)

   Smoke candles and blower-door tests can help identify less-than-obvious leaks. The Weatherization article describes methods for energy savings further. If infiltration is reduced below 0.35 ACH, it is recommended that mechanical ventilation (typically an exhaust fan or heat recovery ventilation ) be implemented.

5. Interior Department rule aims to crack down on methane leaks ...

   www.aol.com/news/interior-department-issues-rule...

   The rule issued by the Interior Department's Bureau of Land Management will tighten limits on gas flaring on federal lands and require that energy companies improve methods to detect methane leaks ...

6. Double check valve - Wikipedia

   en.wikipedia.org/wiki/Double_check_valve

   A dual check backflow preventer is similar to a double check valve in operation. It has two independent spring-loaded check valves. However, dual check valves usually do not include shutoff valves, may or may not be equipped with test cocks or ports, and is generally less reliable than a double check valve.

7. Michael Vick reportedly hired as head football coach at ...

   www.aol.com/sports/michael-vick-reportedly-hired...

   Michael Vick has been hired as the head football coach at Norfolk State, according to multiple reports.. The Virginian-Pilot first reported the news Tuesday night. A news conference formally ...