When selecting a valve for a certain job, why can't just any valve suffice? Perhaps it's enough to choose a valve that's easy to install and operate. Specifying the service, process conditions (temperature and pressure) and requirements for corrosion and abrasion resistance are essential, but what else is needed? Looking to the Web, the Piping Design Central manual valve page provides a glimpse of the details involved with valve selection. More than a dozen links to a variety of published sources are highlighted and summarized. These include valve basics, discussions of valve standards, and specifics about butterfly, ball and plug valves. Additional information about valves is available through some of the pull-down menus accessed by clicking "subjects" or "download" on the navigation bar near the top of the page. For the latter, under "refcharts," there are two Novotek Inc. piping "cheat sheets" that can be downloaded (right-click and save from your browser). The first includes 150 lb through 900 lb flanged gate, globe and check valve dimensions. There also is a handy pipe reference chart from OnlinePipe with pipe dimensions and weights for various schedule wall thicknesses of pipe in sizes from 1/8 in. to 144 in. OD.

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