Selection principle and category function of chemical valve

Chemical valve is an important accessory of fluid control on industrial pipeline Facing various working conditions of complex industrial system and various valves, if you want to select suitable valves for pipeline system, you should first understand the performance of valves, second master the steps and basis of selecting valves, and third follow the principle of selecting valves for Petroleum and chemical industry Chemical valve not only has a wide range of application, but also has a large amount of consumption Of course, chemical valve has higher requirements than ordinary valve Chemical valves generally use corrosive media Simple chlor alkali industry, to large petrochemical enterprises, have high temperature, high pressure, corrosion resistance, wear resistance, large temperature pressure difference In the face of this high risk valve, in the selection and use process should be strictly in accordance with chemical standards Taichen company is a professional chemical valve manufacturer, manufacturing in strict accordance with the standards of the Ministry of chemical industry Selection principle of chemical valve: in chemical industry, straight through valve with small flow resistance is generally selected as the flow passage, and valve for cut-off and open medium is usually selected, and valve easy to adjust flow is used for flow control, plug valve and ball valve The valve Zui with wiping function is suitable for the medium with suspended particles Common chemical valves include ball valve, gate valve, stop valve, safety valve, plug valve, check valve, etc The main stream of chemical valve media contains chemical substances, including a variety of acid and alkali corrosive media The chemical valve materials of taichen manufacturer are mainly 304L and 316, and the common medium is 304 as the leading material Alloy steel or fluorine lined valve is used for corrosive fluid combined with various chemicals Chemical valve type function: opening and closing type: cut off or communicate the flow of fluid in the pipe; regulating type: regulate the flow and flow rate in the pipe; throttling type: make the fluid produce great pressure drop after passing through the valve; other types: A automatic opening and closing; B maintain a certain pressure; C steam blocking and drainage Precautions before use of chemical valve: ① whether there are sand holes, cracks and other defects on the inner and outer surfaces of valve body; ② whether the valve seat is firmly connected with the valve body, whether the valve core is consistent with the valve seat, and whether the sealing surface is defective; ③ whether the connection between the valve stem and the valve core is flexible and reliable, whether the valve stem is bent, and whether the thread is damaged; chemical standard for steel flange: Technical code for engineering construction of the Ministry of chemical industry [hgj44-hgj68-1999] standards of the Ministry of chemical industry; European system [hg20592-hg20605-1997] standards of the Ministry of chemical industry; European system [hg20613-hg20623-1997]