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 ▼

[ It is claimed:] [1.] A safety shut off valve for a fluid delivery system, comprising:a hollow housing for defining a fluid communication path, said housing including an inlet for receiving upstream fluid and an outlet for discharging the received fluid downstream;an upstream web member mounted wit

[ It is claimed:] [1.] A safety shut off valve for a fluid delivery system, comprising:a hollow housing for defining a fluid communication path, said housing including an inlet for receiving upstream fluid and an outlet for discharging the received fluid downstream;an upstream web member mounted within said housing for helping to define an inlet chamber within said housing for receiving fluid from the fluid delivery system;a downstream web member mounted within said housing for helping to define an outlet chamber within said housing for discharging fluid downstream in the fluid delivery system;said upstream web member and said downstream web member being space apart from one another for defining an interior chamber within said housing;a valve seat disposed within said outlet chamber for helping to facilitate the blocking of said communication path;a movable valve member disposed within said outlet chamber from 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 at said downstream web member unlocking said fluid communication path;a hollow magnet housing supported from below by said downstream web member for helping to define a magnet oscillatory path extending along another portion of said fluid communication path;a moveable magnet disposed within said magnet housing for moving along said magnet oscillatory path between an attracting position at about said downstream web member and a disengagement position at about a top portion of said magnet housing;said magnet exerting a sufficient magnetic force to attract and hold said movable valve member in said open position when said magnet is disposed at about said attracting position and not a sufficient magnetic force to attract and hold said valve seat member when disposed at about said 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 and disposed outside of said magnet housing; anda spring supported from below by said upstream member and coupled to said mass for imparting oscillatory movement to said mass and said magnet in response to a lateral force being exerted against said housing, said lateral force having a predetermined magnitude and another natural frequency;wherein the movement of said magnet reaches a maximum displacement when the natural frequency of said spring and said mass in combination and the natural frequency of said lateral force are substantially the same.