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At its annual convention at Dallas, TX, the NFPA formally adopted a standard with 2 + 1 ⁄ 2-inch hose with 7.5 threads per inch as the primary standard, with additional sizes of 3 and 3.5 inches (each with 6 threads per inch) and a 4.5 inch coupling with 4 threads per inch, with the fire hydrant standard specifying one 4.5 inch port and two 2 ...
The balance lever coupling, also central buffer coupling with two screw coupling, is a coupler commonly used on narrow gauge railroads with tight curves. By swapping the pulling and pushing devices, the standard screw coupling used on standard gauge railroads became a center buffer coupling with one screw coupling on each side of the buffer.
Dimensions and ratings noted in these articles are usually of nominal or typical components and systems, though standards and practices also vary widely with railway, region, and era. Transition between incompatible coupler types may be accomplished using dual couplings, a coupling adapter or a barrier wagon.
Storz connector. Storz is a type of hose coupling invented by Carl August Guido Storz [] in 1882 and patented in Switzerland in 1890, and patented in the U.S. in 1893 [1] that connects using interlocking hooks and flanges.
A gladhand connector or gladhand coupler is an interlocking hose coupling fitted to hoses supplying pressurized air from a tractor unit to air brakes on a semi-trailer, [1] or from a locomotive to railway air brakes on railroad cars. [2] Gladhand connectors resemble a pair of "hands shaking" when interlocked, hence the name. [1]
This coupling is used by Spanish firefighters, and is defined by Spanish Standard UNE 23400. [15] It is a sexless coupling with three engaging lugs, and is available in several different sizes, including Barcelona 25 (25 mm hose ID), Barcelona 45 (45 mm hose ID), and Barcelona 70 (70 mm hose ID). Suitable for delivery (pressure) only, not suction.
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