Patent ID: 7740230

Claim:
A pig for installing a cable in a conduit, wherein said pig comprises a body and a seal intended to follow the internal surface of the conduit and arranged to make circumferentially continuous pressure sealing contact therewith, the seal having a V-shaped cross-section with a radially outer side of the V forming a lip including a v-shaped recess within said v-shaped cross section, the body comprising a radially elastic relatively thin wall tubular part on which the seal is mounted, and a radially resilient support part fixed to or integral with the tubular part, being radially inwardly bounded by the thin wall tubular part and having an outer diameter larger than a diameter of a main length of the tubular part and extending radially outward of a center of the V of the seal such that said thin wall tubular part axially supports the seal wherein said seal has radially extending grooves and prevents the lip from reversing when subjected to relatively high pressure, the support part having a guide surface arranged to guide the pig in the conduit, the outer diameter of the guide surface being slightly less than the maximum diameter of the seal, so that the support part is mechanically resiliently deformed by the internal surface of the conduit operating through the guide surface and, in turn, radially deforms the tubular part when the pig passes through deformed parts of the conduit.