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Air admittance valves (AAVs, or commonly referred to in the UK as Durgo valves and in the US as Studor vents and Sure-Vent®) are negative-pressure-activated, one-way mechanical valves, used in a plumbing or drainage venting system to eliminate the need for conventional pipe venting and roof penetrations.
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An air-operated valve, also known as a pneumatic valve, is a type of power-operated pipe valve that uses air pressure to perform a function similar to a solenoid. As air pressure is increased, the compressed air starts to push against the piston or diaphragm walls which causes the valve to actuate. Whether the valve opens or closes depends on ...
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The NFL playoff schedule is set. As the final components of the playoff picture fell into place in Week 18, the league revealed its slate for the wild-card round.
The Franklin County Sheriff's Office continues to look for a gunman who fatally shot a man last Friday night in the parking lot of a Home Depot store in Prairie Township.