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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.
Each year, representatives from around the world travel to the National Board Testing Laboratory north of Columbus, Ohio to measure the performance of their company’s pressure relieving devices. Tested products undergo independent certification of function and capacity.
Denison Hydraulics is a publicly traded U.S.-based company (Stock Symbol:DENHY) that manufactures industrial hydraulic fluid power systems (hydraulic pumps, motors, valves and engineered systems [1]) and components and is headquartered in Marysville, Ohio. Denison is owned by Parker Hannifin.
Dixon Valve & Coupling Company, LLC [1] is a manufacturer and supplier of hose fittings and accessories. The company, often referred to as just Dixon, offers products for fire protection, food processing, dairy processing, beverage and brewery operations, industrial manufacturing, mining, construction, chemical processing, petroleum processing and refining, oilfields, mobile tankers and ...
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Ohio, Pennsylvania and West Virginia combined form the third-largest natural-gas-producing region in the entire world behind only the remainder of the United States and Russia.
State Legal Status Alabama: Class II machines legal Alaska: All machines legal Arizona: All machines legal Arkansas: All machines legal California: Machines 25 years or older legal Colorado: Machines before 1984 legal Connecticut: All machines prohibited Delaware: Machines 25 years or older legal Washington, D.C. Machines before 1952 legal
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.