Butterfly valve installation and maintenance should note the following: 1. During installation, the valve should be stopped in the closed position. 2. Open position should be determined by the rotation angle of the disc. 3. Butterfly valve with bypass valve should open bypass valve before opening. 4. Should be installed according to the manufacturer's installation instructions, heavy butterfly valve, should be set up a solid foundation. First, the concentric butterfly valve The butterfly valve structural features for the stem axis, butterfly center, body center in the same position. Simple structure, easy to manufacture. Common rubber lining butterfly valve that belongs to this category. The disadvantage is that the disc and valve seat is always in the squeeze, scratch status, resistance, wear fast. Single eccentric butterfly valve In order to solve the concentric butterfly valve butterfly valve seat squeeze, resulting in a single eccentric butterfly valve, the structural characteristics of the stem axis deviation from the butterfly center, so that the upper and lower disc no longer Become the axis of rotation, decentralized, reducing the over-squeeze of the upper and lower disc and valve seat. Third, the double eccentric butterfly valve in the single butterfly valve based on the further improvement of the shape is currently the most widely used double eccentric butterfly valve. Its structural feature is that the valve rod axis deviates from the center of the butterfly plate as well as the center of the valve body. Double eccentric effect of the valve is opened, the disc can be quickly separated from the seat, a substantial elimination of disc and valve seat unnecessary over-squeeze, scratch phenomenon, reducing the open resistance, reducing wear and tear, improve Seat life. Four, three eccentric butterfly valve to high temperature, you must use a hard seal, but the large amount of leakage; to zero leakage, you must use a soft seal, but not high temperature. In order to overcome this contradiction of double eccentricity butterfly valve, the third eccentricity was performed on the butterfly valve. A butterfly valve is a type of valve that opens and closes and regulates a fluid passage by using a circular disc as an opening and closing member and rotating with a valve stem. The butterfly valve not only has the advantages of simple structure, small size, light weight, low consumption of materials, small installation size, small driving torque, simple and quick operation, but also simultaneously. Good flow control and close the sealing features, in large and medium caliber, low pressure in the field of use, the butterfly valve is the leading form of the valve. With the application of anti-corrosion synthetic rubber and PTFE, the performance of butterfly valve can be improved and satisfied with different working conditions. Over the past decade, the rapid development of metal seal butterfly valve, with the high temperature, low temperature, corrosion resistance, resistance to erosion, high strength alloy material in the butterfly valve application, the metal seal butterfly valve in the high temperature, low temperature, strong erosion Under conditions such as operating conditions have been widely used, and partially replaced the globe valve, gate valve and ball valve. Structural features: Butterfly valve has the characteristics of simple structure, small size, light weight, material consumption, small installation size, rapid switching, 90 ° reciprocating rotation, low driving torque and the like for cutting off, connecting and regulating the medium in the pipeline , With good fluid control features and close the sealing performance. Nominal pressure or pressure level: PN1.0-4.0MPa, ANSI CLASS 150-300LB, JIS10-20K Nominal diameter or diameter: DN40 ~ 2000 Connection: flange connection, butt connection, butt welding and lugs folder Connection Applicable temperature: -196 ℃ ~ 700 ℃ Drive: Manual, worm gear, pneumatic, electric, hydraulic, gas-liquid linkage, electro-hydraulic linkage Valve body material: HT200, WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), Ti. Search Keyword: More Valve Technical Articles
Nanjing Chinylion Metal Products Co., Ltd , https://www.clrack.com