Pipe clamp inner seal
A sealing of pipe repair clamps is taught providing a flexible inner sheet or sleeve adapted for duty inside a pipe repair clamp to prevent leakage of the fluid to be transported in a pipeline. The inner sheet or sleeve may be used in combination with a band-type pipe clamp of various types. The clamp may also be useful for temporary or permanent repair of a leaking pipe and for connecting two pipe ends. The clamp may include, in a pipe clamp or coupling for pipes by means of a metal clamping band to surround the pipes, and a flexible inner sheet or sleeve disposed inside the clamping band, having reinforcing material bonded to or embedded in the inner sheet or sleeve to inhibit axial expansion when the inner sheet or sleeve is under compression between the pipes and the clamping band.
1. In a pipe clamp or coupling for pipe repair or for sealing relationship of two pipes by means of a metal clamping band to surround at least one of said pipes, and a flexible inner sleeve disposed inside said clamping band, said flexible inner sleeve carries an array of depressions over most of its inner face, the improvement comprising a reinforcing material embedded within said inner sleeve, fibers of said reinforcing material are parallel to axis of said pipe clamp or coupling to inhibit axial expansion of said inner sleeve when said inner sleeve is under compression between said at least one of said pipes and said clamping band, wherein said flexible inner sleeve is provided with sealing lips protruding from said inner face and integral to said flexible inner sleeve on its inner face to contact said at least one of said pipes, said sealing lips are made to form circumferential sealing ring around said at least one of said pipes, and wherein said sealing lips are formed with edges which bent down and sideward when in contact with said at least one of said pipes to increase sealing of said sealing lips when liquid fills depressions on the sides of said sealing lips.
2. The improvement to a pipe clamp or coupling as claimed in claim 1 , wherein said reinforcing material is an aramide fiber.
3. The improvement to a pipe clamp or coupling as claimed in claim 1 , wherein said flexible inner sleeve comprises a flat mat having a first end and a second end, said first end being attached to said band and said second end being free to overlap the inner surface of said mat retained in a cylindrical configuration when disposed inside said band.
4. The improvement to a pipe clamp or coupling as claimed in claim 1 , wherein said ends of said flexible inner sleeve are tapered in a peripheral direction.