| 摘要 |
A gas line shut-off assembly which is automatically actuated in the event of a catastrophic break of a gas line, wherein gas is retained safely inside the remaining intact portion of the gas line. The gas line shut-off assembly is preferably composed of two mutually cooperating components, a breakaway and a shut-off. The breakaway has a weakened wall section. When connected to a gas line, the breakaway serves as a weakest location of the gas line so that should the gas pipe thereof be subjected to shear forces sufficient to break (ie., rupture) it, the gas line will break firstly at the breakaway. The shut-off is located upstream of the breakaway and is composed of a valve body and a perforated piston. The piston has a head and the valve body has seat, wherein the piston is movable in the valve body between a rest location and a seated location. At the seated location the piston head is sealably seated at the seat, thereby preventing gas flow through the valve body. In operation, during normal gas flow, the piston remains at or near the rest location, but if a break occurs the piston sealingly seats at the seat, shutting gas flow. In the event of breakage, the breakaway provides a break location downstream of the shut-off.
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