Emergency shutoff valve for use in a fuel dispensing system

摘要

An emergency shutoff valve is provided that includes a housing defining a fluid inlet, a fluid outlet and a fluid flow passage extending therebetween. The valve includes a valve element disposed within the housing and releasably latched in an open position by a latching mechanism. An expansible member defines at least a portion of a sealed expansible chamber that is sealed at locations downstream and upstream of a weakened portion of the housing. The valve includes an access port in fluid communication with the chamber. The access port may be used to test the integrity of the expansible member. An expandable material may also be disposed in the chamber and used to shut off the valve on the occasion the housing is compromised to an extent wherein fuel can flow into the expansible chamber.