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Labyrinth seals are also found on pistons, which use them to store oil and seal against high pressure during compression and power strokes, as well as on non-rotating shafts. In these applications, it is the long and difficult path and the formation of controlled fluid vortices plus some limited contact-sealing action that creates the seal.
The Christmas Seal Catalog (PDF). The Christmas Seal and Charity Stamp Society. 2014. The Christmas Seal Catalog is a simplified version of Green's Catalog of TB Seals of the World, part 1, U.S. National Christmas Seals. Green, Dick (1946) [1936-1937]. Green's catalog of the tuberculosis seals of the world (revised through 1946) Pt. 1-3.
In philately, the Higgins & Gage World Postal Stationery Catalog is the most recent encyclopedic catalogue of postal stationery covering the whole world. Despite most volumes not having been updated for over thirty years, the catalogue and the H & G numbering system are still widely used by philatelists and stamp dealers although the values given in the catalogue are out of date.
This Catalog is divided into 10 sections which catalog hundreds of fundraising seal issuing societies such as, Easter Seals (U.S.), Boys Town (organization) listed in the Catholic section, National Wildlife Federation, listed in the Pets, Plants, and Wildlife section, and National Association for the Advancement of Colored People listed in the ...
Category 2 seal are intended for API-610 This category is applicable for temperatures between –40 °F and 750 °F (-40 °C and 400 °C) and pressures to 615 PSI (42 bar). Category 3 seals are essentially the original seals of 1st Edition and are also intended for API-610 pumps. Category 3 seals are intended for the most demanding applications.
In mechanical engineering, an end-face mechanical seal (often shortened to mechanical seal) is a type of seal used in rotating equipment, such as pumps, mixers, blowers, and compressors. When a pump operates, the liquid could leak out of the pump between the rotating shaft and the stationary pump casing. Since the shaft rotates, preventing this ...
The Next Whole Earth Catalog (ISBN 0-394-70776-1) in 1980 was well received, and an updated second edition followed in 1981. The 1980s also saw two editions of the Whole Earth Software Catalog, a compendium for which Doubleday had bid $1.4 million for the trade paperback rights. [7]
Seals are still used for official purposes in a number of contexts. When collecting parcels or registered post, the name seal serves as an identification, akin to a signature. In banks, traditionally the method of identification was also by a seal. Seals remain the customary form of identification on cheques in mainland China and Taiwan. Today ...