Fluid handling – Processes – Cleaning – repairing – or assembling
Patent
1990-05-29
1991-11-19
Walton, George L.
Fluid handling
Processes
Cleaning, repairing, or assembling
137318, 83 54, 409304, 409313, F16K 4300, F16K 5100
Patent
active
050657801
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method and means for connecting a branch conduit to an existing conduit through a valve of such a design that in its open position the valve has a straight flow channel, preferably a valve of plug or ball type. More particularly the invention is adapted for connecting branch conduits to conduits in systems filled with a fluid (liquid or gas).
BACKGROUND ART
Several methods and means for connecting branch conduits via valves to conduits in systems filled with a fluid are previously known. According to one method described in the Swedish patent No. 425 185 the valve is connected to the conduit in such a way that its flow channel will be tangential to the conduit. By means of a completely tight tool fixed to the outlet of the valve a piston could be moved into the flow channel by means of applied forces. The front end of the piston which is shaped as or provided with a separate cutting edge also comprises a portion formed as a hook. During the axial movement of the piston through the flow channel its front end provided with the cutting edge will cut an opening in the conduit. By means of the special design of the piston with a portion formed as a hook the cut-out portion of the conduit will be caught by and maintained in the piston. When the cutting operation has been finished, the piston is brought back to its initial position, the valve is closed and the tool fixed to the outlet of the valve is removed together with the cut-out portion of the conduit. The tool is now replaced by a branch conduit, the valve is opened and the fluid can flow out into the branch.
The design of the front end of the piston with a gap between the cutting edge and a portion formed as a hook for retaining the cut-out portion of the conduit, sets certain requirements on the conduit to which the branching is to be made. The material has to have a certain hardness so that the cut-out portion of the conduit will be fastened in the gap and follow the piston after the cutting operation when the piston is withdrawn into the tool. If the conduit hasn't the assumed hardness but has been subjected to changes due to age or if it has been made red-hot for some reason e.g. while bending, so that its material properties have been changed, there is the risk that the cut-out portion of the conduit will be dropped into the conduit. The cut-out portion can then be transported with the fluid be out of order.
SUMMARY OF THE INVENTION
The object of the present invention is on the one hand to eliminate the dependence on the method of the material properties of the conduits and on the other hand to simplify the cutting tool and its handling.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a sectional view of a ball valve fixed to a conduit and, an embodiment of a cutting tool an outlet of the valve is shown in the initial position.
FIG. 2 shows the same valve and tool as in FIG. 1 but after the cutting of the conduit.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
The ball valve shown in FIG. 1 comprises a housing of two parts 1 and 2 in which housing a ball 3 provided with a through hole is arranged. The ball which is fitted between two stuffing washers 4 and 5 is provided with a recess 6 reachable from the outside if a plug 7 is removed. By means of a suitable tool the ball can be rotated in order to adjust or cut off the flow in the flow channel 8. Several plugs 7 with corresponding recesses 6 in the ball could be arranged in the valve housing making it possible to operate the ball from the side which has the best accessibility. The housing part 1 is formed as a conduit connection and encases the conduit 9 shown in cross section and to which the housing is fixed by means of a clamp 10. The outlet 11 FIG. 2 of the valve is arranged in a connection piece 15 located in the housing part 2 to which a branch conduit, not shown, is to be connected. Instead of the branch conduit a tool is connected to the valve in the figure. The tool comprises a housing 16 in which a piston 12 is slidably arranged
REFERENCES:
patent: 1907188 (1933-05-01), Ransdell et al.
patent: 3983897 (1976-10-01), Gebelius
patent: 4261384 (1981-04-01), Dahlbring
patent: 4415000 (1983-11-01), Odmann
patent: 4457204 (1984-07-01), Blomgren
patent: 4541447 (1985-09-01), Soumar et al.
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