n piping systems, elbows are fittings that change the direction of piping. According to the Angle, there are three kinds of zui commonly used, including 45° and 90°180°, in addition to 60° and other abnormal Angle elbows according to the engineering needs. Elbow materials are cast iron, stainless steel, alloy steel, calcined iron, carbon steel, non-ferrous metal and plastic. The connection mode with the pipe includes: direct welding (common way of zui) flange connection, hot melt connection, electric welding connection, screw connection and socket connection, etc. According to the production process, it can be divided into: welding elbow, stamping elbow, hot pressing elbow, push elbow, casting elbow, forging elbow, clip elbow, etc. Other names: 90° bend, right Angle bend, love bend, white steel bend, etc.
Stainless steel characteristics: strength, toughness index is all kinds of steel zui good, the prominent advantage of its zui is corrosion resistance, in chemical industry and paper making and other corrosive occasions must use stainless steel, of course, the cost is also high.
In the use and maintenance of stainless steel elbow need to pay attention to many matters, need users to use in accordance with a certain method, in accordance with the accurate and reasonable method to use and maintenance. The precautions are as follows:
1, long-term storage of stainless steel elbow, should be scheduled for inspection, often on the exposed processing surface must be kept clean, remove dirt, neatly stored in the indoor dryness, do not pile or open storage. Always keep the stainless steel elbow dry and draughty, keep it clean and tidy, store it according to the accurate storage method.
2, installation, stainless steel elbow can be directly installed in the pipe according to the connection mode, according to the use of the position for installation. In general, can be installed in any position of the pipeline, but need to facilitate the inspection of the control, pay attention to the media flow direction of the stainless steel elbow should be vertical valve disc below the upstream, stainless steel elbow can only be installed horizontally. Stainless steel elbow in the installation of attention to sealing, to prevent leakage phenomenon, affect the normal operation of the pipeline.
3, stainless steel elbow ball valve, globe valve, gate valve use, only for full open or closed, do not allow to regulate flow, so as to avoid erosion, accelerated wear sealing surface. There is an inverted sealing device in gate valve and upper thread globe valve, and the hand wheel is screwed to the zui position to prevent medium leakage from the packing.
4, stainless steel elbow application hand wheel, do not use leverage or other tools, so as to avoid damage to the valve. Clockwise rotation of the hand wheel is closed and vice versa. The use of ziah should be fair, to ensure accurate use of methods and means.
5, stainless steelelbow valve packing gland bolts should be tightened evenly, should not be pressed into a crooked state, so as not to damage the valve stem movement or cause leakage.
6, stainless steel elbow in the process of use, should often keep clean, transmission thread must be lubricated on time, found fault, should immediately stop using, find out the reason to remove the fault.