A valve for controlling the flow of fluids of a flammable nature and under high pressure,PLUG VALVES which includes a hollow body having a plug rotatably mounted within the body between the floating seats at inlet and outlet ports with a packing plate in the bonnet capable of maintaining a seal against loss of fluids when the valve has been subjected to high temperature caused by fire.  In a high pressure plug valve including a hollow body with opposed inlet and outlet ports adapted to be connected to pipeline to control high pressure fluid flow and a bonnet extending perpendicular to said body, seats at said openings,Reducing Valves a plug rotatably mounted in said body between said seats, a stem extending upward from said plug and bearingly received in the bonnet and extending out of the body for wrench engagement to rotate the plug between open and closed positions,Safety Valves and a packing plate above the plug and in the bonnet to seal between the body and the stem, the improvement in the packing plate which includes an annular metal ring with O-ring grooves opposite the respective surfaces of the body and stem to be sealed and on the plug side of the stem, resilient O-rings in each of said grooves, notches in the metal ring above each of the O-ring grooves, and nonresilient high temperature graphite ring seals along each of said notches directly backing up each of the O-rings, whereby the fluid under pressure in the valve body which leaks by the mating surfaces of the plug and seats causes the O-rings and ring seals to coact and seal between the metal ring and adjacent bonnet and stem surfaces. This invention relates in general to a high pressure plug valve for controlling the flow of fluids, and more particularly to a valve capable of withstanding high temperature conditions caused by fire without leaking, and still more particularly to a firesafe high pressure plug valve for handling highly corrosive and flammable liquids. Heretofore, it has been well known to provide high pressure plug valves for handling the flow of liquids under high pressure. These valves and the valve of the present invention are especially useful in controlling the flow of petroleum products. An example of the type of valve heretofore known is shown in U.S. Pat. No. 3,326,516. However, this patented valve and other high pressure plug valves have not been capable of being firesafe because the packing or seals used cannot withstand high temperatures without failing.

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