The difference between cold galvanized elbow and hot galvanized elbow? What is the difference between cold galvanized and hot galvanized? Not only the difference between cold and hot names, we simply understand: cold galvanized elbow galvanized layer is a plating layer, zinc layer and elbow matrix independent Layered. The zinc layer is thin, and the zinc layer is simply attached to the steel pipe substrate and it is easy to fall off. Therefore, its poor corrosion resistance. In new homes, it is forbidden to use cold galvanized elbows as connecting parts for water supply pipes. Forged flange
Here are all the machines for making the silicone phone case
the vacuum machine is for reduce the the bubble from liquid silicone,
the dispensing machine is for filling the logo of the mold with liquid silicone,
the baking machine is for drying and baking the liquid silicone material,
the gum machine is for mixing the solid silicone and color,
the cutting machine is for cutting the solid silicone into a piece, can avoid to wast the material,
the Hydraulic Machine is for heating press the mold with the silicone, and finish the silicone phone case finally.
Reducing elbows are the diameters of the pipes at the two ends of the elbow. These elbows are usually used when the pipes are diverted or when pipes are changed. Generally, the small-diameter elbow's wear resistance is smaller than that of the large-diameter one. Better, because when the fluid passes through the reduced-diameter elbow, when the same volume of fluid is passed in unit time, the flow rate of the two-port fluid is different, and the flow rate of the fluid at the small port is greater than that of the large port. At large, this increases the friction of the fluid elbow at the small port. Another point is that the elbow is usually concentric and can be made eccentric according to needs.
Commonly used grades of carbon steel include Q235, 20# and A105.
Commonly used grades of stainless steel are 304, 304L, 316, 316L, 321, 00Cr17Ni14Mo2, etc.; alloy material commonly used brands are 15CrMo, 1Cr5Mo, 16Mn, 12Cr1MoV, F11, F22, 10CrMo910 and other materials: copper alloy, nickel alloy elbow is used To change the direction of pipes or pipelines, different pipe systems require different materials for elbows. For example, in the water pipe system, engineering plastic elbows, stainless steel elbows or chrome-free alloy elbows are usually used; In natural gas pipelines, alloy elbows or stainless steel elbows with high-pressure resistance are usually used. In oil pipeline systems, alloy elbows with high-pressure resistance are usually used.
Degrees are: 45 ° elbow, 90 ° elbow, 180 ° elbow, etc., there are some non-standard degrees. The bending radius is also often referred to as R, generally divided into: 1 times, 1.5 times; respectively with R = 1D, R = 1.5D said. Also some multiples are R=2D, R=2.5D, and the bigger multiple is the elbow, which is the mid-frequency elbow. The above information was published by Zhangzhou Xinhang Pipeline Equipment Co., Ltd. (For reprint please specify, thank you!
Hot-dip galvanized elbows react the molten metal with the iron matrix to produce an alloy layer that combines both the matrix and the coating. In hot dip galvanizing, the elbow is first pickled. In order to remove the iron oxide on the elbow, after pickling, it is cleaned by an aqueous solution of ammonium chloride or zinc chloride or an aqueous solution of ammonium chloride and zinc chloride. Feed into hot dip tank. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.
The use of galvanized elbows:
Application of galvanized elbow The type of iron pipe connection for gas and heating is galvanized elbow. The galvanized elbow is used as connecting pipe. After a few years of use, a lot of rust is generated in the pipe. The outflow of yellow water not only pollutes the sanitary ware. , And mixed with bacteria that are not smooth inside the wall, rust caused by high levels of heavy metals in the water, serious harm to human health. In the 1960s and 1970s, the developed countries in the world began to develop new types of pipes and banned galvanized pipes and galvanized elbows.
Galvanizing technology is not only used for elbows, but pipe fittings such as three-way, flange, four-way, and small-sized heads can all be galvanized.
What is a shrimp elbow?
The shrimp waist is a kind of elbow in the pipe fittings. The lumbar elbow of the shrimp is very common and the production method is very simple. However, the traditional method is difficult to operate on the large diameter elbows in the industry, and it is difficult to ensure the accuracy. It is now possible to calculate the length of the prime line at each point using the computer drawing stakeout, and then to take the same number of copies of the coiled tube, intercept the line segment with the calculated length on the prime line, and connect the endpoint to draw the cutting line. Wall thickness processing method: When setting out, first draw the theoretical cutting line, and then determine the position of the highest and lowest point (after opening the groove) cutting line according to the wall thickness. After connecting the two points, calculate the line points of each point. The length is crossed and cut on the coiled tube. After the pair is aligned, the required angle can be guaranteed. The national standard is S02403 steel pipe building standard. Materials are generally carbon steel, stainless steel and alloy steel. In the daily construction, the waist elbow of the shrimp is much less than that of the elbow welded with the original tube and the midplane.
The lumbar elbow of shrimp is usually made of carbon steel. The pressure applied by the method of production is not too great. In the low pressure pipeline, the degree is not only 90 degrees, 180 degrees, and 45 degrees, but also any degree. 
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