Abstract: The branch pipe forming apparatus 100 includes a first split member 3 and a second split member 4, which include split surfaces 3a and 4a along a plane including an axial center X of the existing pipe W and an axial center Y of a branch pipe 2, and which are connected to each other in a sealed state by a fastening member B. An axial center Z of a tube part 31 is located closer to the branch pipe 2 than to the outer circumferential surface of an existing pipe W in a cutter accommodation space Sp. The first split member 3 and the second split member 4 are coupled to each other at respective coupling portions with respective coupling openings opposite to each other across the drilled hole Wa and the cutter accommodation space Sp and holding therebetween an end portion 2A of the branch pipe 2 in a sealed state.

Abstract: A hermetically sealing device has a sealing main-body and a rubber seal adhered to the sealing main-body. The rubber seal includes an inner lip, a slit and an outer lip. The inner lip extends along a periphery of the bored opening, and includes an outer-circumference surface that extends forward and inclines toward an inner-circumference side. The slit is formed on an outer-circumference side relative to the inner lip. An outer-surface-side edge of the bored opening enters the slit. The outer lip is formed on an outer-circumference side relative to the slit that is formed on an outer-circumference side relative to the inner lip, and transforms in such a manner that the outer lip extends toward an outer-circumference side to be hermetically in contact with an outer surface of the periphery of the bored opening.

Abstract: A gate valve includes a valve body for insertion through a through-hole formed in the fluid pipe, and a movement mechanism for moving the valve body along the diameter direction, and the valve body includes a valve main body and a seal member that is capable of undergoing elastic deformation and is provided on a holding portion of the valve main body. A core member formed from a material harder than the seal member is embedded between an outer face of the seal member, which is on the lower side in the movement direction, and a leading end face on the protruding side of the holding portion.

Abstract: A gate valve includes a valve body for insertion through a through-hole formed in the fluid pipe, and a movement mechanism for moving the valve body along the diameter direction, and the valve body includes a valve main body and a seal member that is capable of undergoing elastic deformation and is provided on a holding portion of the valve main body. A core member formed from a material harder than the seal member is embedded between an outer face of the seal member, which is on the lower side in the movement direction, and a leading end face on the protruding side of the holding portion.

Abstract: A hermetically sealing device has a sealing main-body and a rubber seal adhered to the sealing main-body. The rubber seal includes an inner lip, a slit and an outer lip. The inner lip extends along a periphery of the bored opening, and includes an outer-circumference surface that extends forward and inclines toward an inner-circumference side. The slit is formed on an outer-circumference side relative to the inner lip. An outer-surface-side edge of the bored opening enters the slit. The outer lip is formed on an outer-circumference side relative to the slit that is formed on an outer-circumference side relative to the inner lip, and transforms in such a manner that the outer lip extends toward an outer-circumference side to be hermetically in contact with an outer surface of the periphery of the bored opening.