Beijing type stop valve: 1. J41H/W is a straight-through globe valve, which relies on the stem pressure to make the disc sealing surface closely combined with the seat sealing surface to prevent the medium from flowing. In the process of opening and closing, the friction between the sealing surface is small, the opening height is small, and the manufacturing process performance is good
. It is a kind of valve used in the industrial sector. Flange connected globe valve is suitable for nominal pressure PN1.6 ~ 16MPa, working temperature -29 ~ 550ºC petroleum, chemical, pharmaceutical, fertilizer, power industry and other working conditions of the pipeline, cut off or connect the pipeline medium. The driving mode is manual, electric, pneumatic and so on. 1, the selection of materials, in line with domestic and foreign standards, reasonable structure, beautiful shape. Second, J41H Beijing type globe valve product structure characteristics 1. According to GB12235, the product has reasonable structure, reliable sealing, excellent performance and beautiful shape. 2. The sealing surface of the valve disc and seat is made of stellite cobalt-based cemented carbide surfacing. 3. The valve stem has good corrosion and abrasion resistance after tempering and surface nitriding treatment. 4. Various pipe flange standards and flange sealing surface types can be used to meet various engineering needs and user requirements. 5. Valve body material variety ***, packing, gasket according to the actual conditions or user requirements reasonable selection, can be applied to a variety of pressure, temperature and medium conditions. 6. The reverse seal is made of austenitic stainless steel, the reverse seal is reliable, and the replacement and maintenance of the filler can be carried out without stopping, which is convenient and fast and does not affect the operation of the system. Three, the globe valve has the following advantages: 1. Simple structure, convenient manufacture and maintenance. 2. Small working trip, short opening and closing time. 3. Good sealing, small friction between the sealing surface, long life. The disadvantages of the globe valve are as follows: 1. The fluid resistance is large, and the required force is large when opening and closing. 2. Not suitable for medium with particles, high viscosity and easy coking. 3. Poor adjustment performance. Fourth, the principle is: 1, high temperature, high pressure medium pipelines or devices should be *** stop valve. Such as thermal power plant, nuclear power plant, petrochemical system of high temperature, high pressure pipeline. 2, pipe road convection resistance requirements are not strict pipe road. That is, where the pressure loss is not considered much. 3, small valves can *** needle valve, instrument valve, sampling valve, pressure gauge valve, etc.
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