亚洲 国产 欧美 日韩 另类 综合_大学生一级毛片在线播放_99精品桃花视频在线观看_国产在线观看 91_岛国无码中文字幕_免费看的黄色网站孕妇_欲求不满中文字幕_惠民福利日韩精品无码专区免费播放_日本A√亚洲国产尤物_极品呦女专区资源

First, the main purpose of large-caliber electric valve

High and medium pressure flanged gate valve for the nominal pressure PN1.6 ~ 16.0MPa, the working temperature ≤-29℃~ 550℃ of petroleum, chemical, hydraulic, thermal power plant in various systems of pipeline, cut off or connected to the pipeline medium . Suitable media: water, oil, steam, and acid, alkali, ammonia, urea, sulfur and other natural gas. Mode of operation are: manual, gear transmission, electric, pneumatic and so on.

Second, large-diameter electric gate valve application specifications

Third, large-diameter electric valve structure and characteristics

1, Selection of sophisticated, in line with relevant standards at home and abroad, the overall high-quality materials. 
 2, In line with the requirements of advanced standards at home and abroad, reliable sealing, excellent performance, handsome in appearance. 
 3, Advanced and reasonable pairs of seal pair, gate and valve seat sealing surface with different hardness Stellite (Stellite) cobalt-based hardfacing welded together, reliable sealing, high hardness, wear resistance, high temperature resistance, corrosion resistance , Good scratch resistance, long life. 
 4, The stem by quenching and nitriding surface treatment, good corrosion resistance, scratch resistance and wear resistance. 
 5, The use of wedge-type flexible gate structure, setting large diameter thrust bearings, friction is small, and with a collision manually, opening and closing easily. 
 6, Can adopt all kinds of pipe flange standard and flange sealing surface to meet various engineering needs and user requirements.

Fourth, large-diameter electric valve parts and materials and the main purpose

Fifth, large-diameter electric gate valve main dimensions