초록 ▼

An safety shut off valve automatically shuts off in response to seismic or other shock wave forces of a predetermined magnitude and thereafter automatically reset when there is no discernible excess gas flow due a downstream broken or leaking pipe. The shut off valve generally includes a housing hav

An safety shut off valve automatically shuts off in response to seismic or other shock wave forces of a predetermined magnitude and thereafter automatically reset when there is no discernible excess gas flow due a downstream broken or leaking pipe. The shut off valve generally includes a housing having a mass spring system mounted therein for translating lateral seismic and other shock forces exerted against the housing to an axially movable magnet for decoupling a valve member plate attracted thereto allowing it to block the downstream fluid communication path. A small bypass flow permits the valve member plate to be automatically reset in engagement with the magnet when the atmospheric pressure upstream of the plate is substantially equal to the atmospheric pressure downstream of the plate.

대표청구항 ▼

[ I claim:] [1.] A safety shut off valve for a fluid delivery system, comprising:a hollow housing for defining a fluid communication path;a valve seat disposed within said housing to facilitate the blocking of said communication path;a movable valve member disposed within said housing for moving in

[ I claim:] [1.] A safety shut off valve for a fluid delivery system, comprising:a hollow housing for defining a fluid communication path;a valve seat disposed within said housing to facilitate the blocking of said communication path;a movable valve member disposed within said housing for moving in a rectilinear path of travel along a portion of said fluid communication path between a closed position at said valve seat blocking said fluid communication path and an open position spaced from said seat unblocking said fluid communication path;a moveable magnet disposed within said housing for moving along a magnet oscillatory path coaxial with said rectilinear path of travel of said movable valve member between a valve member attracting position and a valve member disengagement position;a mass coupled to said magnet for helping to produce a natural frequency of vibration of a sufficient amplitude to move said magnet between said attracting position and said disengagement position, said mass being spaced from said magnet; anda coil spring coupled to said mass for imparting oscillatory movement to said mass and said magnet in response to a lateral seisnic force being exerted against said housing.