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A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. [1] Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various ...
A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. [1] It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the highest pressure source.
Duckbill exhaust valve for Draeger twin hose regulator. A duckbill valve is a check valve, usually manufactured from rubber or synthetic elastomer, and has two or more flaps, usually shaped like the beak of a duck. [1] It is commonly used in medical applications to prevent contamination due to backflow. A cross-section diagram of a Duckbill valve.
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Iron work is a skilled craft that dates back to the late 19th century and is a result of the rapid rise in the use of modern steel in iron bridges and skyscrapers. [4] It was and is also an exceptionally dangerous job; hundreds of iron workers fell to their death every year in the late years of the nineteenth century.
The Manistee Iron Works, also known as the Excello factory, was a manufacturing company based in Manistee, Michigan.While the company has since gone out of business, the factory built by the company in 1907 continues to bear the company's name and is a landmark in Manistee's historic downtown area.
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From 1907, Davey, Paxman & Co, [3] and later the Erie City Iron Works in Pennsylvania built Lentz's steam engines. In total, Lentz acquired some 2000 patents. He is best known for his steam valve gear with oscillating and rotating cams to actuate poppet valves .