| 摘要 |
A front insertion type union is provided to make size of a union screw unit larger than diameter of a penetration unit of a flange unit according to design and to easily combine pipes and simplify the structure by forming a female screw as the union screw unit. A front insertion type union comprises a union flange(10) formed with a screw at the rear side to be connected with a first pipe and a fixing unit(12) at the front side to a smaller diameter than diameter of the rear side; and a union screw unit(15) formed with a protrusion unit(16) on a part of the upper and lower parts of the circumferential surface to be held on the fixing unit at the front side of the union flange and to a diameter possibly to be inserted to the front side of the union flange at one side, and with a screw unit at the other side to be connected with a second pipe. The union screw unit is inserted to the front side of the union flange. The screw of the union flange is a female screw.
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