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Method and principle of manufacturing pressure-bearing hole sealing equipment. Principle of pressure-containing plugging: On a pipeline in operation within a pressurized transmission system, at both ends of the section where various construction works or emergency repairs are to be carried out, dual plugging can be implemented. Using hole-plugging technology equipment, it is necessary to interrupt the flow of the medium in that section; temporary bypass connections installed on the hole-plugging devices at both ends of the section allow the medium within the pipeline to continue flowing through a temporary bypass, thus ensuring that the urban pipeline network remains capable of normal economic operation throughout the construction process. Depending on the purpose of the construction work and the type of pipe structure, double sealing and double blocking are required when replacing valves, replacing pipe sections or rerouting pipes, inserting tees into the pipes, or dealing with other faults in the pipes. In such cases, the goal is to prevent access to those openings – that is, to the two openings at each end of the pipe section, which are equipped with standard construction equipment – by using tubular components that are pre-welded to the special polyethylene pipes, so that holes of appropriate sizes can be created through these components to allow access. After the opening is created, sealing is performed from the position of the sealer. The plug head closes downward the opening, which, together with the hole in the actuating block, allows a folding cup or \"interlayer\" valve plug to block the corresponding ends of the medium flow that are facing each other within the hole of the pipe section. Equipment for opening holes under pressure and sealing them: The technology for opening holes and sealing them consists of a mechanical system with three different components – an hole-opening machine, a sealer, and a lower sealer – each serving distinct economic purposes. They share a single frame, which is composed of components such as fan clamping valves, upper and lower connectors, left and right positioning fixtures, temporary bypass interfaces, release valves, pressure gauges, etc. The operation involves opening the machine chassis; the sealers and blocker housings provide support, while the PE pipes are connected using the right and left fixing devices, which also serve to clamp them in place. The lower connector is connected to the specialized PE fittings and sealed ； The upper connector will be connected to the opening machine, the plugger, and the lower plugger respectively, and sealed ； The fan-shaped element, operated through a clamp valve, is an important device that must be opened and closed during the process of opening holes for sealing as well as when replacing the equipment springs. The frame can be made of aluminum alloy, which, after being treated through anodic oxidation, possesses a high surface hardness, corrosion resistance, wear resistance, and low weight. Tapping machine: It is a tapping machine composed of drill rods, tool holes, differential feed mechanism connection plates, enclosures, and sheath control handles, along with other components. This machine requires manual operation for opening the holes; it features a hole diameter support for cutting. In its automatic differential feed drilling mode, it drills the central hole using a center drill, and the cut material is removed accordingly. The entire machine has a compact structure, is small in size, light in weight, simple to operate, and easy to use. Lower plug: The lower plug is composed of components such as the main shaft, left and right clamping blocks connected to it, and a control rod. Its function is to provide sealing at the bottom of the mouth of the electrically fused PE pipe plug designed for plugging holes. The claw is mounted on the left and right main shafts at the lower part; during the clamping operation of the sealing plug for specially melted PE pipes, there is a movable insertion pin, a gear for positioning, and an actuating device on the main shaft. Obturator: The obturator is composed of a main shaft, an eccentric connecting disc, a foldable rubber cup obturator tip, and a control mechanism; the components are made of specific materials. The sealing device is a key piece of equipment for achieving sealing and stopping the flow of fluid in pipes after they are opened or closed. Its eccentric disc, along with the spherical pivot mechanism connected to the head, is inserted into the hole that has been prepared in the cup, via a blocking rod; the pressure tube then seals this opening, thereby driving the conical-sealing head to move forward. The above is an explanation of the manufacturing method and principle of pressure-bearing hole opening and sealing equipment.