In the valve pipeline, the expansion device is an important part of the whole set of equipment, which has different functions according to different designs, so as to ensure the normal operation of the valve. The functions of the limit expansion device are introduced one by one below.

Use of limit retractor: retractor is a new product that connects pumps, valves, pipes and other equipment to pipes. What should I pay attention to when using it? The expanders are connected by bolts during installation and use, so that they are integrated with the pipeline, and have a certain displacement, which is convenient for installation. Can withstand the axial pressure of the pipeline. In this way, it can be adjusted according to the installation dimensions on site during installation and maintenance. During work, it not only improves work efficiency, but also protects pumps, valves and other pipeline equipment. The pipeline expander is suitable for the transportation of seawater, fresh water, hot and cold water, drinking water, domestic sewage, crude oil, fuel oil, lubricating oil, refined oil, air, gas, steam and granular powder at a temperature not higher than 250 degrees. Pipe expanders are usually used as pipe fittings, and the correct selection and use are very important.

How to adjust the installation length of the limit retractor. First, when adjusting the installation length of the limit retractor product, the product should be in a natural state, and then loosen the original limit bolts, and then loosen the seal pressure plate bolts, and remove the telescopic tube from the body. Pull out, adjust to the length of use, and then connect the connecting flanges at both ends, and first press the sealing pressure plate. During the pressing process, refer to the design and installation requirements, and tighten the sealing parts of the product diagonally to adjust the product limit. Position distance, so as to achieve correct installation and use. The installation length of the limit retractor refers to the amount of installation at the pipe interface required during the installation process. Generally, the installation length of the product has been adjusted according to the national standard and the actual installation length when the product leaves the factory, but In the actual application process, it is also necessary to adjust the installation length of the product on site to meet and facilitate the use of on-site installation applications.

Related knowledge: Valve is a kind of pipeline accessory. It is a device used to change the section of the pipeline and the flow direction of the medium, and control the pressure, flow, and temperature of the conveying medium. Specifically, it has the following uses: Pass or cut off the medium in each section of the pipeline, such as: gate valve, globe valve, butterfly valve, ball valve, cock, etc. Adjust the flow and pressure of the pipeline, such as: regulating valve, throttle valve, pressure reducing valve, butterfly valve, ball valve, etc. Change the flow direction of the medium, such as: distribution valve, three-way cock, three-way ball valve, etc. Used for overpressure protection, such as valves, relief valves. Prevent the back flow of the medium in the pipeline, such as: check valve to indicate and adjust the liquid level, such as: liquid level indicator, liquid level regulator, etc. Separate air and water in pipelines, such as steam traps and air traps. Temperature adjustment in the pipeline, such as: temperature regulating valve, temperature and pressure reducing device.