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Reed valves, normally a leather flap covering a hole, are amongst the earliest form of automatic flow control for liquids and gases.They have been used for thousands of years in water pumps and for hundreds of years in bellows for high-temperature forges and musical instruments such as church organs and accordions.
Leaf valves are commonly mounted in the intake port of most 2-stroke motorcycle engines. When the piston moves up in the cylinder, the valve opens and allows air and fuel to pass through the intake port and into the carburetor. When the piston moves down, the valve closes and the compressed air in the cylinder is forced out through the exhaust ...
The reed valve opens when the crankcase pressure is slightly below intake pressure, to let it be filled with a new charge; this happens when the piston is moving upwards. When the piston is moving downwards the pressure in the crankcase increases and the reed valve closes promptly, then the charge in the crankcase is compressed.
A Cox Babe Bee 0.049 in 3 (0.80 cm 3) reed valve engine, disassembled, uses glow-plug ignition. Its mass is 64 g. The reed valve is a simple but highly effective form of check valve commonly fitted in the intake tract of the piston-controlled port. It allows asymmetric intake of the fuel charge, improving power and economy, while widening the ...
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A science fair or engineering fair is an event hosted by a school that offers students the opportunity to experience the practices of science and engineering for themselves. In the United States, the Next Generation Science Standards makes experiencing the practices of science and engineering one of the three pillars of science education.
Reed and Stem, former architecture firm St. Paul, Minnesota; Reed Arena, a sports arena in College Station, Texas; Reed College, Portland, Oregon Reed Research Reactor, a research nuclear reactor at the college; Reed, Portland, Oregon, the surrounding neighborhood; Reed-Custer High School, in Braidwood, Illinois; Reed Elsevier, a publishing company
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