| 摘要 |
<p>The invention is related to an access fitting for attaching a device (6c), such as a probe,within a process pipeline or vessel containing fluids. The access fitting comprises a plug (1c), a fitting (2c) and a seal (3c)arranged in an annular groove in the surface of the plug (1c) to provide a sealing effect between the fitting (2c) and the plug (1c). The plug (1c) is preloaded against the fitting (2c) by means of torque- induced clamping force. The plug (1c)is preloaded by the threaded pins (5)accommodated within corresponding radially extending apertures (8) formed in the fitting (2c)to establish a conical metal-to- metal contact between the pins (5) and plug (1c). The radially compliant seal (3c) becomes self-energized by the line-pressure itself inside the pipe or vessel. The access fitting provides a pipe fitting which increases sealing efficiency and safety, reduces torque needed for necessary preload and at the same time improves the plug's lateral stiffness.</p> |
