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Tilting-disc inconel check valve Check valve symbol on piping and instrumentation diagrams.The arrow shows the flow direction. Vertical lift check valve. 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.
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HP EliteBook is a line of business-oriented high-end laptops and previously mobile workstations made by Hewlett-Packard . [1] The EliteBook series, which fits above the small business ProBook series, [ 2 ] was introduced in August 2008 [ 3 ] [ 4 ] as a replacement of the HP Compaq high end line of business laptops.
The HP Pavilion dv4 featured a 14.1" and the HP Pavilion dv5 a 15.4" display. The dv7 had room for two hard drives, but was supplied with one because if a second hard drive was to be fitted, then a hardware kit consisting of a bracket, connector cable, Mylar shield, and screws was required.
English: The vector graphic contains SVG renditions of groups 21-25 of ISO 10628-2:2012(en), "Diagrams for the chemical and petrochemical industry — Part 2:Graphical symbols". The groups are: 21: valve 22: check valve 23: valves and fittings with safety functions 24: fittings 25: graphical symbols for piping Links to all sheets in the set:
This symbol is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Redrew jpg as svg. The original can be viewed here: Check valve.jpg: File:Check valve.jpg. Modifications made by Gregors.
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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.