| http://www.w3.org/ns/prov#value | - However, when it is desired to restrict the flow of air through passage 16, such as to control the speed of movement of a piston associated with an air cylinder, then the actuating member 29 is rotated, as by a screwdriver or other tool, whereupon the threaded engagement between the actuating member and the threaded bore 27 causes the member to be moved axially inwardly so that the sleeve 44 hence
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