Patent ID: 7849882
Filing Date: 2010-12-14
Classification: F16L

Abstract:
1. A double plug head to be inserted into a main pipe by a plugging machine so as to plug the main pipe, the double plug head comprising: a primary rubber packing provided on a mounting plate of the plugging machine, wherein said primary rubber packing has an annular rim configured to come into close contact with an inner surface of the main pipe; a roller support provided with a plurality of rollers; a tube support provided between said primary rubber packing and said roller support, wherein a tube seating depression is formed around a circumferential surface of said tube support, further wherein a fluid feed path is formed in said tube support, and wherein said fluid feed path communicates with said tube seating depression; and a rubber tube seated in said tube seating depression of said tube support, wherein said rubber tube is provided with a nipple connected to an outlet of said fluid feed path, further wherein first and second communication holes are respectively formed in said primary rubber packing and the mounting plate, further wherein said first and second communication holes communicate with said fluid feed path of said tube support, further wherein a fluid hose is connected to the second communication hole of the mounting plate, and wherein the fluid hose extends to the outside of the main pipe.