99久久精品国产一区色,亚洲午夜精品久久久久久APP,蜜臀色欲AV无码人妻,国产一区二区av

Author:site | 2023-06-01
The history of the regulator

Regulating valve growth since the beginning of the 20th century has been 80 years of history, has bred ten categories of regulating valve products, independent valve and positioner, regulating valve and control valve on the process as follows:

May 20: The original control valve for steady pressure was introduced.
 
30 May: To "V" notch of the two-seat valve and single seat valve as the representative product of the V-shaped ball valve.
 
40 years: The emergence of positioner, new varieties of regulating valves are further bred, the appearance of estranged valves, Angle valves, butterfly valves, ball valves, etc.

Ball valves were widely used, and three-way valves replaced two single-seat valves into the system.
 
June 60: A complete series of products was produced in China only after a series of innovation plans, scales and examples were carried out for the above products. Now we are still in the use of a large number of single-seat valve, two-seat valve, Angle valve, three-way valve, barrier valve, butterfly valve, ball valve seven products are still 60 years of the product. At this time, overseas began to launch the eighth kind of layout control valve - sleeve valve.
 
July 70: Another product of a new layout, the preferred rotary valve (the ninth category of the layout of the regulator variety). This period of the sleeve valve is widely used overseas. At the end of 1970, Domestic Unity planned sleeve valves, which made China have its own product line of sleeve valves.
 
1980: During the period of innovation and opening up, China Lecheng introduced the stone dressing device and regulating valve skills, so that the sleeve valve and preferential rotary valve have been popularized and utilized. In particular, the sleeve valve has the potential to replace the single and double seat valve, and it is used more and more widely. At the end of 80 years, regulating valve and a large hope this Cv3000 and fine small regulating valve, they in layout, the single spring pneumatic film implementation mechanism to multi-spring film implementation mechanism, valve layout is just innovation, not change. Its outstanding characteristic is to make the weight and height of the control valve fall 30%, the flow coefficient progress 30%.


90 years: 90 years of control valve focus on reliability, especially difficult products, innovation, progress. By the end of 1990, Waring had introduced a tenth layout, the all-function ultralight valve. It is characterized by a breakthrough in reliability, efficiency and weight. Efficiency breakthrough - the only product with full efficacy, therefore, can be replaced by a product on the extensive effect of the product is not complete, so that the selection of simplified, simplified use, simplified varieties; Breakthrough in weight - than the leading product of single-seat valve, two-seat valve, sleeve valve 70 ~ 80% light, than fine small valve also 40 ~ 50% light; Reliability breakthrough - for the traditional control valve and other factors, such as sealing reliability, positioning reliability, reliability of action. The advent of the product, so that China's control valve skills and application degree reached the end of the 90 years of the ancestral level; It is a huge breakthrough on the replacement valve; In particular, electronic super light valve with full effect will become the mainstream of regulating valves in the coming century.

免费无码婬片AAAA片小说直播 | AV无码国产精品 | 精品人伦一区二区三区蜜桃网站 | 午夜成人亚洲理伦片在线观看 | 亚洲一级av无码毛片精品 | 免费一级婬A片久久久爽死你网站 | 午夜成人性视频免费 | 日本中文字幕免费在线观看 | 国产精品久久久久久 | 蜜桃视频无码区在线观看 | 国产日韩欧美精品 | 日韩高清无码四区 | 一区二区三区视频杨思敏 | 成人午夜在线视频 | xxxx国产精品 | 少妇冒白浆视频在线观看 | 动漫3D精品一区二区三区 | 国产三級片黃色三級片黃 | 日韩欧美视频一区 | 午夜亚洲AⅤ无码高潮片苍井空 | 欧美寡妇性猛交XXXXX欧美 | 蜜桃蜜臀色欲AV在线播放 | 亚洲AV成人片色在线观看www | 国产成人V在线精品一区 | 在线免费看黄网站 | 国产成人精品一二三区 | 少妇搡BBBB搡BBB搡抖音 | 国产美女菊爆在线观看 | 欧美成人性色欲影院 | 国产全肉乱妇杂乱视频 | 懂色av粉嫩av色欲av | 亚洲成人中文字幕 | 国产又黄又粗又猛又爽 | 国产成人无码精品电影 | www.av中文字幕 | 中文字幕精品无码一区二区 | 国产aaaaaaaa| 欧美精品黑人猛交高潮 | 91精品人妻一区二区三区蜜桃臀 | 国产精品欧美亚洲韩国日本不卡 | 精品人妻艳妇嫩草AV少妇 |