A shut-off system of the present invention includes a straight pipe made of a polyolefin-based material, and a knife gate, wherein: a semicircular arc-shaped first cutting blade is formed on a distal end side of the knife gate to cut open the straight pipe to form a slit-shaped opening; an arc band-shaped sealing portion is formed on a proximal end side of the knife gate to be in contact with cut surfaces of the straight pipe; the knife gate includes a pair of side edge portions that connect the first cutting blade and the sealing portion; the first cutting blade and the side edge portions bite into an inner circumference surface of the straight pipe along the inner circumference surface; the knife gate is formed in a flat plate shape having a first surface and a second surface, extending from the first cutting blade to the sealing portion and between the pair of side edge portions; the opening extends in a circumferential direction on the straight pipe; and the sealing portion extends from one end of the opening to the other end thereof, and extends from the inner circumference surface to an outermost surface, which is on an outermost side, of the straight pipe.
F16L 55/105 - Closing devices introduced radially into the pipe or hose
F16K 3/02 - Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
A structure including: a straight pipe made of a polyolefin-based material; a pair of ridges made of a polyolefin-based material, extending in a circumferential direction along an outer surface of the straight pipe, and spaced apart from each other in an axial direction of the straight pipe; a piping material including a plurality of metal-made separate cases, which are separated from each other in the circumferential direction of the straight pipe and enclose a portion of the straight pipe; and a pair of engagement portions formed on at least one of the separate cases and engaging respectively with the pair of ridges.
B29C 65/04 - Dielectric heating, e.g. high-frequency welding
B29C 65/00 - Joining of preformed parts; Apparatus therefor
F16L 41/06 - Tapping pipe walls, i.e. making connections through the walls of pipes while they are carrying fluids; Fittings therefor making use of attaching means embracing the pipe
A piping structure and a process, with which it is possible to form an opening in a pipe while preventing shavings produced from cutting from entering the pipe. A process for forming an opening in a pipe, including: a step of enclosing the pipe with a case divided in a circumferential direction R of the pipe; a skin formation step of cutting an outer surface of the pipe with a cutting tool arranged in the case, thereby forming a bottomed groove, which is formed as a skin, on the pipe; a suction step of sucking shavings produced from cutting, together with a gas in the case in order to remove the shavings; and breaking the skin to form the opening after performing the skin formation step and the suction step.
F16L 41/06 - Tapping pipe walls, i.e. making connections through the walls of pipes while they are carrying fluids; Fittings therefor making use of attaching means embracing the pipe
F16L 55/105 - Closing devices introduced radially into the pipe or hose
4.
Insertion of butterfly valve without disrupting flow
A process including: an assembly step of assembling a sealed case onto an existing pipe; a cutting step of forming a first opening of a groove shape elongated in a pipe axis direction of the existing pipe; a second boring step of forming a circular second opening at a position of the existing pipe that opposes the first opening; and an insertion step of inserting, in a valve-open state, a butterfly-shaped valve element that is integral with a valve rod, which runs through the first and second openings, into the existing pipe 1 through the first opening until a tip portion of the valve rod protrudes from the second opening.
F16K 27/02 - Construction of housings; Use of materials therefor of lift valves
F16K 3/22 - Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
F16K 41/08 - Spindle sealings with stuffing-box with at least one ring provided with axially-protruding peripheral closing-lip
F16L 41/06 - Tapping pipe walls, i.e. making connections through the walls of pipes while they are carrying fluids; Fittings therefor making use of attaching means embracing the pipe
F16L 55/00 - Devices or appurtenances for use in, or in connection with, pipes or pipe systems
The present flow-undisrupted process includes: enclosing a portion of an existing pipe with a sealing case; connecting a boring machine to the sealing case in a non-valve state in which no operation valve is interposed between a projecting pipe portion of the sealing case and the boring machine; forming a circular opening in an area of the existing pipe corresponding to the projecting pipe portion by means of a hole saw of the boring machine; rotating a tee and the boring machine in a circumferential direction of the existing pipe to a position at which the projecting pipe portion is completely past the opening; after the rotation, maintaining a sealed state in which the seal packing prevents a pressure of a fluid inside the existing pipe from being applied to the projecting pipe portion; and removing the boring machine from the projecting pipe portion in the sealed state.
F16L 41/06 - Tapping pipe walls, i.e. making connections through the walls of pipes while they are carrying fluids; Fittings therefor making use of attaching means embracing the pipe
B23B 41/00 - Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
F16L 41/08 - Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of a wall or to the axis of another pipe
F16K 1/22 - Lift valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
6.
Device for work implementation without stopping flow, and method for work implementation without stopping flow
An apparatus including: a sealing case having a branch hole formed in a first separate case and extending in the radial direction of an existing pipe; and a rubber packing for sealing a gap between the sealing case and the existing pipe, wherein: the first separate case has a flange for attachment and removal of a boring machine; the sealing case reciprocates in a pipe axis direction; the rubber packing forms; a first sealed area surrounding a portion of the sealing case for shutting the branch hole; a second sealed area being adjacent to, sealed against, displaced from the first sealed area in the pipe axis direction, and sized so as to be able to shut the opening bored by a cutter; and a tolerance space, into which a second seal ring escapes, is formed between a packing attachment groove and the second seal ring.
F16L 55/18 - Appliances for use in repairing pipes
F16L 55/10 - Means for stopping flow in pipes or hoses
F16L 41/06 - Tapping pipe walls, i.e. making connections through the walls of pipes while they are carrying fluids; Fittings therefor making use of attaching means embracing the pipe
F16L 41/16 - Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of a wall or to the axis of another pipe the branch pipe comprising fluid cut-off means
F16K 3/02 - Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
An apparatus including: a sealing case including separate cases and enclosing a portion of an existing pipe, and a valve cover portion attached to a branch pipe portion protruding upwardly from the existing pipe; a gate valve body accommodated by the valve cover portion and the branch pipe portion to be intruded into the existing pipe to stop the flow of the fluid through the existing pipe; an operation valve body having an arc-shaped lateral cross section for opening/closing a branch hole formed in the branch pipe portion by rotating in the circumferential direction of the existing pipe; and a rotation mechanism for rotating the operation valve body, the rotation mechanism including: an operation portion; a driving gear unit which rotates; and a driven gear for rotating the operation valve body in the circumferential direction of the existing pipe following the rotation of the driving gear unit.
B23B 41/08 - Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor for boring, drilling, or tapping holes in tubes under fluid or gas pressure
F16L 55/10 - Means for stopping flow in pipes or hoses
B23B 41/08 - Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor for boring, drilling, or tapping holes in tubes under fluid or gas pressure
9.
Branching unit for boring without stopping passage of fluid
a) that vertically penetrates the cover (66); and by removing the cover (66) from the gear case part (70), the drive gear device (63) can be extracted from the gear case part (70) through the upper aperture.
A branching unit for boring without stopping passage of fluid, which is suitable for forming an opening 11 at a pipe wall 12 by boring a part of the pipe wall 12 of an existing pipe 1 using a drill machine 3 having a hole saw 4 to connect a branch pipe to the existing pipe, comprising: a sealing case 20 having plurality of separate casing 21, 22 separated in a circumferential direction R and a branch pipe portion 27 protruding and branching off in the radial direction C; a valve body 5 rotating between an inner circumferential surface 29 of the separate casing 21, 22 and an outer circumferential surface 13 of the existing pipe 1 to open and close a branch hole 28; and a rotation mechanism 50 rotating the valve body 5.
A non-bolt joint structure comprising; a packing ring sealing between a receiving opening section and an insertion opening section; an engaging means provided with an inner circumference of the receiving opening section preventing a polyethylene pipe from disengaging from the receiving opening section by engaging with an outer circumferential surface of the polyethylene pipe; and a tubular metallic inner core fitting an inner circumference of the insertion opening section of the polyethylene pipe, wherein the inner core is plastically deformed to include a first bulge portion that its cross-sectional shape bulges toward an outward radial direction, a second bulge portion is formed so that the insertion opening section of the polyethylene pipe bulges toward the outward radial direction along the first bulge portion of the inner core, and the polyethylene pipe is prevented from disengaging by the engaging means engaging with the outer circumferential surface of the second bulge portion.
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