Cross-sectional schematic of a 3-way ball valve in each of two positions. Arrows show flow allowed in each position. Blue color indicates the stem. Red color indicates the handle in each position.
H Padleckas created this image file in late August 2006 especially for use in articles on valves in Wikimedia. The schematic style is based on a similar image file, "Image:Ballvalve.jpg", in Wikipedia, drawn by MH and uploaded by Wikipedia:User:Sonett72 on Nov. 23, 2004, which was released to the public domain. H Padleckas 21:03, 20 September 2006 (UTC)
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Here is a gallery of drawings in Engineering Wiki which I worked on: U-tube heat exchanger...