| 摘要 |
A safety shut-off valve assembly is especially for use with a dispenser unit used at retail gasoline service stations. The shut-off valve assembly comprises an open-top fuel flow chamber for permanent mounting at a base of the fuel dispenser, a removable cover plate with a break-away tube member extending therefrom, and a bonnet valve mounted in the open-top fuel flow chamber. An ingress opening in the fuel flow chamber receives a terminus of a primary supply pipeline. The terminus of the break-away tube member serves as an egress for the fuel. The bonnet valve has a plate disc to close off the break-away tube member terminus when needed. When the dispenser unit is disturbed such as by an accidental bumping, the bonnet valve is activated to prevent further flow of fuel into the dispenser unit. The assembly prevents an accumulation of fuel vapors and allows ready access to the primary pipeline for periodic inspection or replacement.
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