蝶閥在使用10,000次以上，仍然能夠保證關(guān)閉時“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，一個公稱通徑10英寸的蝶閥重55磅，而一個10英寸的鑄鐵閘閥重量就高達(dá)490磅。對于整個管道系統(tǒng)來說，采用蝶閥所節(jié)省下來的安裝費(fèi)用就非?？捎^。此外，管道系統(tǒng)越重，就要求管道支撐基座要堅固，因此導(dǎo)致整個管道系統(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.
