Impact Valve An emergency shutoff valve, located beneath a dispenser, to shut off the flow of gasoline in the event of an accident or fire. An impact valve is also called a fire valve, shear valve and crash valve. By rhys|2014-10-20T17:50:03+00:00October 20th, 2014|Comments Off on Impact Valve Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkXingEmail About the Author: rhys