Expandable plug and control method

F - Mech Eng,Light,Heat,Weapons – 16 – L

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Details

F16L 55/134 (2006.01) F16K 7/10 (2006.01) F16L 55/12 (2006.01) F16L 55/128 (2006.01)

Patent

CA 2179630

The invention provides, in a first form, an expandable plug for regulating pressure or flow within a tube. The plug has an inflatable bladder (12) for diametral expansion by internal fluid pressure introduced by inlet (14). The plug is reinforced by an envelope (26) of cords (28) which spread laterally upon inflation of the bladder to provide diametral support to the bladder. In a second form of the invention, an inflatable plug positioned in a tube of internal diameter d is controlled according to the equation Pp = .DELTA.P + Pd wherein Pd is the internal pressure in the plug, .DELTA.P is the differential pressure across the plug and Pd is the plug free expansion pressure for diameter d.

L'invention concerne, sous une première forme, un organe d'obturation expansible servant à réguler la pression ou le débit dans un tube. Ledit organe comporte un cylindre gonflable (12) conçu pour être soumis à une expansion diamétrale sous l'action de la pression interne d'un fluide introduit par l'entrée (14). L'organe d'obturation est renforcé par une gaine (26) de fils (28) qui se répartissent latéralement lors du gonflement du cylindre afin de fournir un support diamétral à ce dernier. Sous une seconde forme, l'invention concerne un organe d'obturation gonflable, positionné dans un tube de diamètre interne d, commandé selon l'équation P¿p?=.DELTA.P+P¿d? où P¿d? représente la pression interne dans l'organe d'obturation, .DELTA.P la pression différentielle d'une extrémité à l'autre de l'organe et P¿d? la pression d'expansion libre de l'organe pour un diamètre d.

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