Double action

Double action may refer to:

• Double-action, a system in firearms where the trigger both cocks and releases the hammer—see trigger (firearms).
• Simple expansion, a system in steam engines and their accessories where a piston has the ability to both push and pull a connecting rod by applying steam pressure alternately to opposite sides of the piston
• Double-acting cylinder, a system in steam and internal combustion engines

This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.