![]() The inherent flow characteristic is the shape of a flow curve through the valve, with a constant pressure drop across the valve. The relative flow coefficient (F) is determined as shown in equation (9). Valve inherent flow characteristicsįigure 16 shows the most common valve inherent flow characteristics. Therefore, careful mechanical and material evaluations should always precede sizing calculations.īecause the valve flow coefficient (C v) reflects the effective flow cross-section of the valve, the valve inherent flow characteristic shows how the effective flow cross-section changes as a function of relative travel (h). It should be noted that these calculations do not, by themselves, guarantee the selection of a correct valve. This control valve selection concentrates on sizing and installed performance considerations. After the valve size has been determined, the installed performance of the valve to phase out poor control performance – like hunting, excessive slow or fast response and poor accuracy – is further predicted. ![]() Secondly, there is the sizing of a selected valve, where the size of the given valve type is determined while trying to prevent unwanted phenomena like excessive noise or liquid cavitation. This selection should be made using bulletins and technical information specific for each valve type. Firstly, there is the mechanical selection in which suitable valve style, materials, and pressure rating are picked to guarantee safe and reliable performance according to good engineering practices, local laws and regulations. Last modified February 22nd, 2023.The selection of a control valve is divided into two parts. Know about this game? Add your expertise to help preserve this entry in video game history!Īdditional contributors: PCGamer77, Sciere, Foxhack, Zeppin, lee jun ho, Patrick Bregger, FatherJack, Harmony♡. ![]() Noah Falstein presents a comprehensive design critique of Portal - from intro to 'Still Alive'.Ī review of the Mac version of Portal by the news and review site, MacGamer (May 18th, 2010).Ī look at the female cast and the influence on the theme, on Heroine Sheik (17th October 2007)Ī pack of custom maps for the game, based on the unofficial 2D flash version. Website of the fictional Aperture Science company with an alternate reality game SpellingsĪn Apple Games article about the Macintosh version of Portal (May, 2010). The Windows game can be bought stand-alone, while the Xbox 360 and PlayStation 3 versions are only available in The Orange Box. Portal is set in the Half-Life universe and it is considered the spiritual successor to Narbacular Drop, some of whose original developers worked on this game. The other mode is Advanced, where levels are made harder through additional obstacles. After completing the game, two additional game modes become available: Challenge where the game needs to be completed in either as little time, as few footsteps, or as few portals as possible. Although the game is played as a first-person shooter, a large amount of strategy and puzzle-solving is involved. These include obstacles but also androids that fire at her. She has to use her new gun to fling, jump and fall her way through 19 puzzles. Chell is promised cake should she be able to overcome the obstacles and perform the necessary tests. They are testing the Aperture Handheld Portal Device (aka Portal Gun) which is able to create portals in space, allowing Chell to move from one point to another without actually crossing the distance. ![]() construct called GlaDOS requiring some tasks to be completed. Chell is a test subject at the "Enrichment Center" facility who awakens to find an A.I. Aperture Science is a secret weapons research organization in competition with Black Mesa. ![]()
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