Patent ID: 8887371
Filing Date: 2014-11-18
Classification: B01J,B01L,F16L,G01N,Y10T

Abstract:
1. A method of coupling tubing to a CPI type port, comprising: inserting the tubing into a hole in a closed end of a cap and extending the tubing out an open end of the cap; inserting the tubing into an open entrance end of a first ferrule, inserting the tubing through a through hole of the first ferrule and extending the tubing out an open exit end of the first ferrule; inserting the tubing into an open entrance end of a fitting body, inserting the tubing through a tubing channel of the fitting body and extending the tubing out an open exit end of the fitting body; inserting the tubing into an open entrance end of a second ferrule, inserting a terminator pin through a through hole of the second ferrule and extending the tubing out an open exit end of the second ferrule; inserting the tubing into a hole in a closed end of a cap and extending the tubing out an open end of the cap; inserting the second ferrule, with the tubing extending out of the exit end of the second ferrule, into the CPI type port that has a threaded section, a conical section which reduces in diameter and a bottom cylindrical section, followed by inserting the fitting body having exterior threading into the CPI type port; and turning the cap, having interior threading at a open end of the cap, onto the exterior threading of the fitting body until the cap is tight and thereby turning the fitting body into the CPI type port as the exterior threading engages the threaded section of the CPI type port during the turning of the cap; forcing the first ferrule into a conical section of the entrance end of the fitting body due to turning of the cap and compressing the first ferrule about the tubing due to turning of the cap; forcing the second ferrule into a conical section of the CPI type port due to turning of the cap and compressing the second ferrule about the tubing due to turning of the cap; and wherein the moment when the cap is first turned, the fitting body begins to turn with the cap and the fitting body threads into the threaded section of the CPI type port; where the turning action of the fitting body into the threaded section of the CPI type port pushes the second ferrule into the CPI type port; wherein the fitting body stops turning as slight pressure begins to accumulate between the second ferrule and the tubing, due to compression of the second ferrule as the second ferrule enters the conical section of the CPI type port, wherein during turning of the cap, the cap begins to push against the first ferrule before the fitting body begins to apply significant pressure against the second ferrule, wherein as the cap is turned, the cap forces the first ferrule into the conical section at the first end of the fitting body and the first ferrule in turn grips the tubing and drives the tubing to the bottom of the CPI type port, as the cap continues to be turned; wherein as the combination of forces resulting from the first ferrule tightening about the tubing at the conical section of the fitting body begins to increase, the cap begins to resist turning against the fitting body, causing the turning forces applied to the cap to be transmitted through the first ferrule to the fitting body and causing the fitting body to again screw into the CPI type port, wherein as the fitting body is screwed into the CPI type port, the second ferrule is driven in to the conical section of the CPI type port, causing the second ferule to be additionally compressed between the CPI type port and tubing and providing a seal between the tubing and the CPI type port; wherein as the second ferrule begins to compress in the conical section of the CPI type port, the second ferrule offers resistance to the screwing of the fitting body into the CPI type port; wherein as the friction between the second ferrule and the tubing increases due to tightening, there is greater resistance to insertion of the fitting body into the CPI type port; wherein the increased resistance causes the cap to again turn relative to the fitting body.