A gas cylinder safety apparatus for a gas cylinder, the gas cylinder being a container with a hole in a top, a bonnet with a threaded hole therethrough is fixedly attached to the container with the bonnet hole aligned with the container hole, the container being fillable with a liquid under pressure, Safety Valves said gas cylinder apparatus comprising:
a service valve, said service valve comprising: a means for releasably controlling the flow of pressurized gas from the gas cylinder, said means being a gas valve in said service valve; and a stem, said stem attached to said means, said stem being threaded for insertion into the threaded hole of the bonnet, said stem having a gas flow channel therethrough,Forged Steel Valves said means for releasably controlling the flow being on the outside of the gas cylinder when said stem is inserted into the bonnet hole, and a removably attachable safety valve, said removably attachable safety valve is for insertion into an end of said stem of said service valve, GATE VALVESsaid safety valve being positioned totally inside of the gas cylinder so as to be protected from external damage to the service valve, said removably attachable safety valve comprising: a housing, said housing having a top being insertable into said gas flow channel of said stem, the top having a gas flow channel therein aligned with the gas flow channel of said stem, said housing having a valve seat therein, a chamber, and at least one gas port in a bottom of said housing, gas from the gas cylinder being able to flow through the gas port, through the chamber, through the valve seat and through the gas flow channel, said housing having an outer diameter less than the diameter of the bonnet hole; a plunger, said plunger being translatable within the chamber, said plunger substantially occupying the chamber and having a tapered top that closely fit within the valve seat, the gas ports being located in the bottom of the chamber away from the tapered top of said plunger, and a spring, said spring biasing said plunger away from the valve seat toward the gas ports, whereby if a sufficient gas flow occurs past said plunger upon the breakage of said means for releasably controlling from said service valve, said plunger shall overcome the bias of said spring to translate through the chamber so the top of said plunger its closely within the valve seat to block the flow of gas, said plunger remaining so positioned until the plunger is positioned away from the valve seat, whereby if said means for releasably controlling is broken from said stem, said means being located on the outside of the gas cylinder, said safety valve being not damaged prevents the unwanted flow of pressurized gas from the gas cylinder, said safety valve may be removed from said stem and placed upon a new service valve after damage to the previous service valve. The safety valve of the present invention has a housing with a threaded top. The service valve stem is threaded to accept the threaded top of the safety valve of the present invention. Inside the housing is a chamber that is in fluid communication with the gas in the gas cylinder and a gas flow channel of the top. A valve seat is positioned between the chamber in the housing and the gas flow channel of the top. A plunger is positioned within the chamber and is biased away from the gas flow channel by a spring. The top of the plunger has a tapered part forming a valve which can be seated in the valve seat of the housing. If a sufficient gas flow occurs, i.e., a difference in pressure between the cylinder and the outside, this will force the plunger into the valve seat blocking the flow until relieved. It is therefore one object of the present invention to provide a safety valve that is easily adapted to the service valve used in conventional gas cylinders. Another object of the present invention is to provide a gas cylinder with a safety valve therein that functions independent of a device attached to the service valve or the service valve itself.

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