Pneumatic plug device

Pipes and tubular conduits – With closures and plugs – Inflatable

Patent

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Details

138 94, F16L 5512, F16L 5510

Patent

active

052340341

ABSTRACT:
An elongated pneumatic plug is provided for sealing pipelines. The pneumatic plug has a body structure with a first end cap element, a second end cap element and an expandable elastomeric sleeve with a fixed outer diameter. A fluid ingress and egress valve is located in the first end element which is positioned adjacent the first segment of the sleeve structure. The elastomeric sleeve structure has a specified length and varying wall thicknesses at specified segments along its length. The segmented lengths comprise a middle segment having a predetermined wall thickness, a first segment having a thickness in a range of approximately 50-65% of the middle segment thickness and a second segment having a thickness in a range of approximately 65-80% of the middle segment thickness. The segmented sleeve structure provides an ordered and staged inflation and deflation of the pneumatic plug body.

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patent: 4377945 (1983-03-01), Digrovanni
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patent: 4967846 (1990-11-01), Wood

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