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• 21:56, 14 May 2009 Technician1002 (talk | contribs) uploaded File:QDV parts.JPG (The quick dump valve has the piston OD the same size as the seat. It requires an external force to start it opening. It has no pilot pressure to hold it against a seat so it is often built with o rings on a piston. The valve cylinder can be built out o)