小视频免费在线观看_夜夜b_男女隐私免费视频_国产一级性生活视频_久久综合入口_精品国内视频

技術(shù)頻道

國外選擇蝶閥時(shí)所考慮的因素


使用壽命 Operating Life  

蝶閥在使用10,000次以上,仍然能夠保證關(guān)閉時(shí)“不透氣”。


  Butterfly valves can operate for


more than 10,000 cycles and still provide "bubble tight" shut off.


壓降 Pressure Drop  


如果壓降太大,會(huì)增加能量消耗。但是,應(yīng)該知道的是,閥門并不是管道系統(tǒng)產(chǎn)生壓降的唯一因素,導(dǎo)致壓降的產(chǎn)生還有下列因素。


管道的流體截面。


管道內(nèi)壁的摩擦力。


通過部件時(shí)流向的改變。


  


蝶閥的流體特性相當(dāng)于截止閥的三倍甚至更高,相當(dāng)于同樣尺寸的閘閥的75%.


  


Energy costs go up with excessive pressure drop. Point to keep in mind–the valve or valves are but one factor in a piping system


that contribute to pressure drop. Of equal concern are these factors:


Flow area of piping.


Friction loss against pipe walls.


Change of flow direction via fittings.


Butterfly valves have flow characteristics


three times better than globe valves and


approximately 75% of an equivalent size gate valve.


通用性 Versatility  


蝶閥通過開啟/關(guān)閉和節(jié)流/平衡來對管道系統(tǒng)進(jìn)行控制和調(diào)節(jié)。與閘閥或截止閥相比,蝶閥具有更好的“通用性”。由于蝶閥能夠采用各種表面處理技術(shù)和選擇彈性材料管道,所以蝶閥具有極強(qiáng)的化學(xué)防腐性能。


  Butterfly valves can be used for on/off service and throttling/balancing.


They are superior in “versatility” as compared to a gate or globe valve.


Butterfly valves have a wider range of chemical resistance due


to the trim options and choice of elastomeric liners.


重量 Weight  


輕型蝶閥的安裝費(fèi)用比重型鑄鐵閥門節(jié)省的多:例如,一個(gè)公稱通徑10英寸的蝶閥重55磅,而一個(gè)10英寸的鑄鐵閘閥重量就高達(dá)490磅。對于整個(gè)管道系統(tǒng)來說,采用蝶閥所節(jié)省下來的安裝費(fèi)用就非常可觀。此外,管道系統(tǒng)越重,就要求管道支撐基座要堅(jiān)固,因此導(dǎo)致整個(gè)管道系統(tǒng)更加昂貴。所以,考慮到閥門的重量,就能夠節(jié)約整個(gè)管道系統(tǒng)的成本。


  Installation dollars saved with lightweight


butterfly valves as compared to heavyweight cast iron valves;


i.e. a 10" butterfly may weigh 55 pounds,


whereas a 10" iron gate may weigh 490 pounds.


This can be an important savings when it is calculated over an entire system.


The heavier the system, the stronger the pipe hangers,


and the more expensive they become.


So by considering the weight of a valve one can also reduce piping system costs.


尺寸大小 Physical Size  


蝶閥所占的空間大約是同等尺寸閘閥的1/6。而每增加一立方英尺的建筑物空間,就意味著成本的浪費(fèi)。


  


例如:公稱通徑10英寸的蝶閥大約是21英寸高,而公稱通徑10英寸的閘閥則高達(dá)43英寸。


  Butterfly valves take up approximately 1/6 the space of a gate valve.


Every cubic foot of a building costs money.


I.E.: 10" butterfly is about 21" high 10" iron gate is about 43" high


氣密性關(guān)閉 Bubble Tight Shut-Off  


閘閥和截止閥(金屬與金屬連接)的閥座不具備不透氣關(guān)閉的性能。Gate and globe (metal to metal) seats cannot provide bubble tight shut-off.


Resilient seated butterfly valves are bubble tight by design.


操作簡便 Ease of Operation  


蝶閥從開啟到關(guān)閉只需要旋轉(zhuǎn)1/4轉(zhuǎn)(90o)。而閘閥和截止閥需要旋轉(zhuǎn)很多轉(zhuǎn)才能將閥門從開啟狀態(tài)轉(zhuǎn)變?yōu)殛P(guān)閉狀態(tài)。開啟或關(guān)閉簡便易行意味著不需要雇用工資太高的操作人員來操作蝶閥。


  Butterfly valves offer 1/4 turn (90o) open to close.


Gates and globes require multiple turns to open and close.


Ease of opening or closing means that butterfly valves can


employ less expensive operators.


成本 Cost  


一個(gè)蝶閥的成本通常只有鑄鐵閘閥的40%,不但購買成本低,而且安裝成本也比較低。


  A butterfly valve is generally 40% the cost of an iron gate.


Not only low initial cost but low installation costs also.


維護(hù)保養(yǎng) Maintenance  


由于蝶閥具有很高的六體系數(shù)和性能很好的彈性閥座,因此蝶閥具有自動(dòng)清洗功能,降低了管道被拉雞雜物堵塞的可能性。


  Properly installed butterfly valves are virtually self cleaning and


are less susceptible to failure due to trash material in the line.




文章版權(quán)歸西部工控xbgk所有,未經(jīng)許可不得轉(zhuǎn)載。

主站蜘蛛池模板: 日韩国产精品视频 | 欧美成人区 | 精品粉嫩aⅴ一区二区三区四区 | 日韩一级免费观看 | 蜜乳av另类精品一区二区 | 岛国大片在线观看 | 精品久久ai | 天堂网亚洲 | 欧美一区二区三区久久精品 | 成人午夜小视频 | 一区二区三区国产免费 | 亚洲一区久久久 | 久久久不卡 | 国产精品成人3p一区二区三区 | 亚洲精品综合精品自拍 | 久久久精品日韩 | 日本在线精品 | 成人观看| 久久视频在线 | 国产一区视频在线 | 蜜桃久久av | 国产精品2018 | 91av视频在线免费观看 | www精品 | 91成人精品 | 成人免费小视频 | 国产一区二区三区久久久 | 91深夜福利 | 国产精品成人在线观看 | 91黄色在线观看 | www.av在 | 久久久www成人免费无遮挡大片 | 美女视频一区二区 | 91国内精品久久 | 国产日韩视频 | 国产成人免费网站 | 国产黄色a级 | 中文字幕在线观看一区二区三区 | 日韩电影免费观看 | 91精品国产成人观看 | 日韩在线视频网 |