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A safety valve adapted to be mounted on a submerged section of oil well pipe for sealing the pipe if an oil leak occurs in the pipe above the valve location. The valve includes a collar rotatably mounted on the pipe and is located between a pair of positioning blocks attached to the pipe. The collar

A safety valve adapted to be mounted on a submerged section of oil well pipe for sealing the pipe if an oil leak occurs in the pipe above the valve location. The valve includes a collar rotatably mounted on the pipe and is located between a pair of positioning blocks attached to the pipe. The collar forms a liquid tight chamber extending on diametrical opposite sides of the pipe. A circular cutting blade is slidably rotatably mounted in one side of the chamber and has an operating shaft which extends outwardly through an end wall opening formed in the collar. The blade is rotated by external means applied to the end of the operating shaft and cuts a hole in the wall of the pipe. A plug is slidably rotatably mounted in the opposite side of the chamber from the cutting blade and has a shaft which extends outwardly through another end wall opening formed in the collar. The collar is rotated 180°on the pipe after the cutting blade has formed a hole in the pipe and the plug is advanced by external means applied to the shaft end of the plug into the pipe bore through the cut hole to seal the pipe. The safety valve can be applied at various locations on a well pipe and will not affect the structure or wall of the pipe until actually needed to seal the pipe should a leak occur.

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A safety valve of the type adapted to be mounted on a submerged section of a well pipe including: (a) a pair of vertically spaced positioning blocks adapted to be mounted on a submerged section of well pipe; (b) a collar adapted to be rotatably mounted on the well pipe between the pair of positionin

A safety valve of the type adapted to be mounted on a submerged section of a well pipe including: (a) a pair of vertically spaced positioning blocks adapted to be mounted on a submerged section of well pipe; (b) a collar adapted to be rotatably mounted on the well pipe between the pair of positioning blocks, said collar being formed with a pair of diametrically opposed fluid tight chambers adapted to communicate with the well pipe when mounted on said pipe; (c) cutter means movably mounted in one of the collar chambers for cutting an opening in the well pipe, with said cutter means being constructed and arranged to be operated externally of said collar; and (d) plug means movably mounted in the other of the collar chambers for extending into the bore of the well pipe through the opening formed therein by the cutter means after rotation of the collar on the well pipe for sealing said pipe bore to prevent flow of a fluid therethrough.