A finned tube is a heat transfer device consisting of many parallel metal fins commonly used for heat dissipation and cooling applications. Finned tubes increase the surface area of the pipe, thus increasing the heat transfer efficiency. Finned tubes are commonly used in applications such as air coolers, automotive radiators, condensers, and evaporators. They are also used in industrial heaters and refrigerators to increase heat transfer surface area and improve efficiency.
Finned tube is a kind of new, wear-resistant, efficient heat exchange material, is a kind of energy-saving heat exchange element, it uses high-frequency power source as heat source, the steel strip, steel pipe heating at the same time, so that the fusion welding together into one, with high heat exchange efficiency, large cooling area, long service life, adapt to a wide range of temperature, high pressure characteristics, it can also be made of a variety of materials, Excellent heat transfer, durability, heat resistance and corrosion resistance. Widely used in waste heat recovery, petrochemical, power plant boiler, economizer, bus, industrial and civil construction heating, refrigeration, medical drying, wood drying, food drying system and other industries.
The main business scope is various heaters, waste heat boilers, pressure vessels, supportingair preheaters, air coolers, furnace accessories and accessories, and provide equipment installation, with EPC ability of projects. At present, our customers have covered all large and medium-sized petrochemical enterprises in China and established long-term strategic cooperative partnership with them. Products are exported to Southeast Asia, Middle East, and other regions.
Finned Tubes,Heat Exchange Finned Tube,Finned Tube Heat Exchanger,Heat Exchange Spiral Finned Tube Jiangsu Gelan Environmental Technology Co., LTD , https://www.glkj2010.com
Analysis of the main factors affecting the sealing performance of hydraulic valve
The main factor of damage to the sealing element is the impurities in the working fluid. These contaminants grind between sealing elements, causing the valve to leak. Therefore, foreign countries have put forward the corresponding level of hydraulic components, the filter should be the appropriate accuracy. They think that 5μM oil seal components, with filter accuracy of 3 / μM filter life expectancy than with 10μM increased 10 times. But the hydraulic support valve, the working environment is very poor. In coal mining face, tubing length of more than 1,000 meters, up to more than 4,000 connector socket, tank no special dust-proof facilities. Emulsion has a large number of floating impurities in the cylinder bottom and the valve cavity, leaving more coal, rock and iron filings. Intake valve plug and seat, due to more frequent opening and closing, high liquid flow, the seal will soon fail. It has proved very difficult to reduce the contaminating impurities in the hydraulic system of the scaffold. It has been envisaged to use a high-pressure filter at the emulsion pumping station while adding a small filter at the inlet of each scaffold. However, it was quickly blocked up at work, resulting in a stoppage. On the other hand, with the development of hydraulic support technology. The use of valve performance and valve life put forward higher requirements. Currently, with a 120-mesh filter and a magnetic filtration device, the life of the hydraulic valve is measured by the total flow of the emulsion through the valve being tested and the number of valve opening and closing. But in fact the indoor type test and the actual results of underground work vary greatly. In many countries, formal tests have increased anti-pollution requirements. Some have incorporated proper pulverized coal in emulsion and some have added mechanical impurities. To this end, the need to use the new, anti-pollution ability, suitable for working conditions downhole seal. Hydraulic support hydraulic valve life is very low, foreign solutions and ways to improve the system's filtration accuracy and improve the quality of emulsion, but with little success. This article analyzes the development process of the seal pair of the holder valve, discusses the relationship between the material of the seal pair and the sealing performance. It is pointed out that the sealing technology is the key to improve the service life of hydraulic valve in hydraulic support. More Keyword Search: Hydraulic Valve