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2. Shutdown valve - Wikipedia

   en.wikipedia.org/wiki/Shutdown_valve

   A shutdown valve (also referred to as SDV or emergency shutdown valve, ESV, ESD, or ESDV; or safety shutoff valve) is an actuated valve designed to stop the flow of a hazardous fluid upon the detection of a dangerous event. This provides protection against possible harm to people, equipment or the environment.

3. List of valves - Wikipedia

   en.wikipedia.org/wiki/List_of_valves

   Valves can be categorized into the following types, based on their operating mechanism: Ball valve, for on–off control without pressure drop. Ideal for quick shut-off, since a 90° turn completely shuts off, compared to multiple 360° turns for other manual valves; Butterfly valve, for on–off flow control in large diameter pipes

4. List of defunct Canadian companies - Wikipedia

   en.wikipedia.org/wiki/List_of_defunct_Canadian...

   A&A Records – founded in Toronto at the end of WWII, it was the dominant record chain store in Canada until being superseded by Sam the Record Man in the 1960s; it became defunct in 1993 A&B Sound – home electronics retailer based in Richmond , BC; founded in 1959, it had expanded as far as Winnipeg , Manitoba by 2000, but its subsequent ...

5. Rockwell International - Wikipedia

   en.wikipedia.org/wiki/Rockwell_International

   General purpose UK-specification electric drill for home/hobby use purchased circa 1980 fitted with UK-standard BS1363 plug-top. Boston-born Willard Rockwell (1888–1978) made his fortune with the invention and successful launch of a new bearing system for truck axles in 1919.

6. AOL Video - Serving the best video content from AOL and ...

   www.aol.com/video

   The AOL.com video experience serves up the best video content from AOL and around the web, curating informative and entertaining snackable videos.

7. Partial stroke testing - Wikipedia

   en.wikipedia.org/wiki/Partial_stroke_testing

   Partial stroke testing (or PST) is a technique used in a control system to allow the user to test a percentage of the possible failure modes of a shut down valve without the need to physically close the valve. PST is used to assist in determining that the safety function will operate on demand.