| 摘要 |
In one aspect of the invention for which protection is sought there is provided an apparatus (1) for providing access to pressurised pipes (24) and the like, the apparatus comprising: a body member (2) having attachment means for attachment of the body member to a pipe or vessel or a fitting coupled to a pipe or vessel, the body member having an internal barrel (6) that may be provided in fluid communication with the pipe or vessel or fitting when the body member is attached to the pipe or vessel or fitting; a hollow piston (3) slidable axially within the internal barrel, the apparatus being configured such that when an internal volume of the piston is pressurised by a fluid from the pipe or vessel a force exerted by pressurised fluid on the piston in a first axial direction is opposed by a force exerted by pressurised fluid on a counter-pressure portion (9, 10) of the piston, the apparatus being provided with a conduit orifice (15) adapted to allow a conduit (16) to be disposed therethrough so as to pass into the apparatus to an interior of the piston, wherein a pressure tight seal (15s) is formed between the conduit and conduit orifice, the apparatus being configured to allow a first end (3a) of the piston to be translated axially into the pipe, vessel or fitting, the piston having a port (21) arranged to allow egress of the conduit from the piston into the pipe, vessel or fitting. |
