Pipe joints or couplings – Convertible
Patent
1980-06-09
1982-08-24
Arola, David
Pipe joints or couplings
Convertible
285101, 285177, 285346, F16L 2500
Patent
active
043457835
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a pipe coupling device, especially for temporary connection of a conduit for pressurized fluid to a pipe section.
A pipe coupling device previously known from the U.S. Pat. No. 2,080,271 comprises a cylindrical, hollow casing or body to be permanently connected to a conduit for pressurized fluid. The casing is provided with a follower nut, which is threaded onto the casing and permits the insertion of two interior gaskets and an intermediate, metallic sleeve radially between the inside of the casing and the outside of the end of a pipe section fitted into the casing. Each gasket is of a standard cylindrical dimension and is formed of resilient material such as rubber or a rubber-like composition, whereas the intermediate sleeve is provided with external and internal recesses or shoulders for receiving each of the gaskets and preventing axial displacement of the latter, when the follower nut is screwed onto the casing. Moreover, the radial dimensions of the intermediate sleeve are chosen in view of the difference between the internal diameter of the casing and the external diameter of the pipe section to be coupled thereto. Thus, upon connection, the joint will be fluid tight. Moreover, standard casings and standard gaskets can be used together with radially different intermediate sleves for connecting pipe sections of different diameters.
However, the purpose of the present invention is to provide a coupling device which premits a simpler and quicker coupling operation, especially for temporary connection of the device to various pipe sections, having different diameters. Particularly, such a device is intended for use in connection with leakage tests of pipes, fluid vessels, heat exchangers, motor parts and other objects which have to be fluid tight. In such a test operation, the object to be tested is normally supplied with a pressurized fluid for a relatively short period of time so as to enable the testing of a large number of units in a given time period.
For this purpose, the coupling device is of the kind comprising a hollow casing for permanent connection to a conduit for the supply of pressurized fluid, a resilient sleeve being disposed in the casing and adapted to sealingly engage the cylindrical surface of the end of a pipe to be connected to the casing, and the device is characterized in that the resilient sleeve is mounted in a separate casing part, which is easily replaceable by a corresponding separate casing part having its own resilient sleeve, the radial dimensions of the respective sleeve being adapted to a particular pipe dimension, and that the sleeve, upon mounting of the separate casing part, is axially compressible between a stationary abutment and a piston, which is operable for axial displacement in the casing and provided with a channel permitting the supply of said pressurized fluid through said piston and into said pipe section.
It has turned out that the inventive device, apart from permitting an easy and quick coupling operation when shifting from one pipe dimension to another, has the advantage that the axial holding power, by friction between the radially expanded sleeve (upon axial compression) and the surface of the pipe, is maintained approximately at the same high level irrespective of the various pipe dimensions, in spite of the fact that the axial force, which is exerted by the pressure of the fluid and tends to axially separate the pipe from the coupling device, is heavily increased when shifting from a smaller to a greater diameter of the pipe.
The invention is explained further below with reference to the drawings illustrating an exemplary embodiment of the inventive device.
FIG. 1 shows in axial section a pipe coupling device according to the invention and the end of a pipe section to be connected thereto;
FIG. 2 shows a device corresponding to that of FIG. 1 but having a casing part with a resilient sleeve of a larger internal diameter adapted to fit onto a pipe section having a larger diameter than that of FIG. 1;
FIG. 3 shows a device c
REFERENCES:
patent: 2080271 (1937-05-01), Hirst
patent: 3147992 (1964-09-01), Haeber et al.
patent: 3923325 (1975-12-01), Slater
patent: 4162092 (1979-07-01), Hayes
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