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    • 37. 发明专利
    • CORROSION RESISTANT STRUCTURE OF BRANCHING HOLED PART IN METALLIC PIPE
    • JPH07332583A
    • 1995-12-22
    • JP15274994
    • 1994-06-10
    • KURIMOTO LTD
    • KITAGAWA MASAYOSHINAKANO RYOICHITOYOSHIMA HIROYOSHISHIOMI ICHIRO
    • F16L41/06F16L58/18
    • PURPOSE:To eliminate an influential element causing rust formation at a branching holed part by keeping a space between the outer peripheral surface of the upper flange of a corrosion resistant sleeve and the shaft hole of a snap tap, and fitting a water expandable O-ring into a kerf recessed in the upper flange. CONSTITUTION:In a corrosion resistant sleeve 2-1 fitted into a circular hole 11 bored for the branching of a cast iron pipe 1, an upper flange 21-1 is locked to the outer edge of the circular hole 11 so as to form the covering face 22-1 for covering the inner peripheral surface of the circular hole 11, and the lower end is bent to form a lower flange 23-1 and pressure- welded to the cement lining 14 or the like on the inner peripheral surface of the cast iron pipe 1. A rubber packing 41 is interposed among a snap tap 3 integrally screw-fitted onto the outer peripheral surface 12 of the cast iron pipe 1, the bottom face of a snap tap saddle 4. and the outer peripheral surface 12 of the cast iron pipe 1 so as to attain water sealing action. An O-ring 25 made of water expandable rubber material fitted into a cut groove 24 recessed in the optional position of the upper flange 21-1 is swollen reactinon with water, passing through a space S formed between the shaft hole 31 of the snap tap 3 and the upper flange 21-1, so as to close the space S and thereby to prevent water from reaching a clearance C.