Gas shut-off valve is an essential equipment for gas transmission and distribution, safe operation of storage tank system and maintenance, reconstruction and development. If the gas valve in the improper selection or poor quality, it may lead to leakage, stop production and other accidents. Therefore, the selection of gas valves must be careful. After many years of practical exploration and data analysis, the artificial gas contains more impurities, especially the "gas glue" formed by the mixture of tar, aromatics and dust, which often affects the valve sealing and even the valve stem. Therefore, the choice of the valve we mainly choose from the structural characteristics of the valve to solve this problem, so as to ensure the valve opening and closing flexibility, no leakage. With the end of the Dayton coal project, the nature of the gas has changed. Natural gas is cleaner and more dry than coal gas, but contains grit dust. The pressure is also higher than that of coal gas. Under high pressure, sand dust will form a strong scouring effect on the valve cavity and the natural gas contains highly corrosive hydrogen sulfide Therefore, how to choose a natural gas valve in the pipeline is a new issue before us. Gas shut-off valve should meet the requirements of natural gas has the characteristics of flammable and explosive corrosive, so installed in the underground pipe network of natural gas valves should meet the following requirements: 1. Material corrosion-resistant pipeline transportation of natural gas containing a large amount of hydrogen sulfide before desulfurization This is a very toxic and highly corrosive gas, which reacts with iron to form iron sulfide flaking off and corroding machinery and equipment. Even after natural gas desulfurization process, there is still residual hydrogen sulfide. Therefore, the selection of pipeline valves should be selected anti-sulfur corrosion-resistant materials. 2. Reasonable structure gas valve should be full-bore design, reducing flow resistance, easy to pass through the pipe sweeper or pipe detector, while saving operating costs; as much as possible to reduce the height of the structure in order to save installation costs; valve should be equipped with fully enclosed Opening and closing indicator, easy to see the operator at any time the valve state, in order to avoid misuse. 3. Good sealing Gas valve leakage requirements are very strict, CJ3055-95 "town gas valve experiment and inspection" standard: soft-sealed valves at 1.1 times the nominal rated pressure does not allow any perceived internal leakage, hard Seal valve 1.1 times the rated nominal pressure allowed within the leakage of less than 0.3DNmm3 / s. As for the external leakage is absolutely not allowed. Usually buried and more important valves are all welded body structure. In order to ensure the sealing performance of pipeline valves, sealing pair with excellent corrosion resistance, wear resistance, self-lubrication and flexibility. 4. Easy operation Underground pipeline valve most of the manpower Kai-shu, so require the valve opening and closing torque is small, the whole circle can not be too much to facilitate the accident as soon as possible after the cut off gas source. 5. Maintenance of simple valve parts design should consider the use of less maintenance, maintenance-free structure, as much as possible to reduce the workload of maintenance and repair, reduce the valve overhaul and closed roads, affecting the traffic situation. With the development of the domestic gas business, the demand for gas-specific valves is increasing. Shanghai Yonglong Valve Factory has developed and launched the above 5-point requirements: gas emergency shut-off valve, liquefied gas emergency shut-off valve, natural gas emergency shut-off valve, gas Cut off the new valve products to meet the needs of market competition. Therefore, when we use the valve should be integrated in all aspects of factors, to ensure safe and reliable, try to save costs, from this perspective, we should be based on gas pressure and the rational use of the pressure of the valve selection, both to meet the pipeline Safe operation can achieve the purpose of reducing cost and making the best use of it.
Outdoor lighting
All our outdoor lighting equipments are IP65 rated to test its ability to withstand the harsh outdoor life. Whether it's a large parking lot or an ordinary courtyard, LEDER has the right outdoor lighting. Suitable for outdoor places such as driveways,paths and parking lots.
l IP65 outdoor rated
l Corrosion resistant finish
l 3 year warranty
Outdoor Hanging Lights,Outdoor Patio Lights,Outdoor Post Lights,Outdoor Flood Lights
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