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The Dunlop valve, (also called a Woods valve, an English valve or a Blitz valve [1]) is a type of pneumatic valve stem in use—mostly on inner tubes of bicycles—in many countries, including Japan, [2] Korea, India, Pakistan, Sri Lanka, most European countries, and a number of developing countries.
The original Schrader valve design was invented in 1891 and patented in the United States in 1893. [2] The Schrader valve consists of a valve stem into which a valve core is threaded. The valve core is a poppet valve assisted by a spring. A small rubber seal located on the core keeps the fluid from escaping through the threads.
Presta valves (also called Sclaverand valves or French valves) are normally only used on bicycles. The stem has a narrower diameter (nominally 6 mm) than the thinnest (nominally 8 mm) Schrader type, and so the bore of the hole in the rim through which the stem passes can be smaller. Has a locknut that needs to be opened to inflate/deflate. [17 ...
The ASME B16 Standardization of Valves Flanges, Fittings and Gaskets Committee, which operates under ASME’s Board on Pressure Technology Codes and Standards is responsible for standards covering valves, flanges, pipe fittings, gaskets and valve actuators for use in pressure services.
It is recommended the valve stem is to be at least 10 mm longer than the rim is deep to allow adequate room for the bicycle pump to be attached. It has a narrower diameter of 6 mm (0.24 in), compared to Dunlop and Schrader valves, measuring 8 mm (0.31 in). The weakest point of a bicycle rim is usually the hole for the valve stem.
A fork might include bottle mounts as well. If equipped a 3 hole configuration is normally used to allow the cage to be mounted higher or lower on the fork. The holes are usually sized and threaded to accept an M5 × 0.8 bolt, which means standard coarse metric threads with 5 mm in diameter and 0.8 mm pitch. [5]
The upper part of the valve stem, within the rocker box, is lubricated by oil. If this oil travels unchecked along the valve stem, engine HC emissions will become excessive. To control this, an elastomeric seal is fitted over the top of the valve guide. These may wear or stiffen with age, so are usually replaced whenever valves are removed for ...
Shelf where holes are placed with 32 mm distance center-to-center for mounting of shelf supports and individual shelves The 32 mm cabinetmaking system is a furniture construction and manufacturing principle used in the production of ready-to-assemble and European-style, frameless construction custom cabinets and other furniture.