蝶阀在使用10,000次以上，仍然能够保证关闭时“不透气”。?
Butterfly?valves?can?operate?for?
more?than?10,000?cycles?and?still?provide?"bubble?tight"?shut?off.?
压降?Pressure?Drop
如果压降太大，会增加能量消耗。但是，应该知道的是，阀门并不是管道系统产生压降的唯一因素，导致压降的产生还有下列因素。??
管道的流体截面。??
管道内壁的摩擦力。??
通过部件时流向的改变。??
蝶阀的流体特性相当于截止阀的三倍甚至更高，相当于同样尺寸的闸阀的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
蝶阀通过开启／关闭和节流／平衡来对管道系统进行控制和调节。与闸阀或截止阀相比，蝶阀具有更好的“通用性”。由于蝶阀能够采用各种表面处理技术和选择弹性材料管道，所以蝶阀具有极强的化学防腐性能。?
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
轻型蝶阀的安装费用比重型铸铁阀门节省的多：例如，一个公称通径10英寸的蝶阀重55磅，而一个10英寸的铸铁闸阀重量就高达490磅。对于整个管道系统来说，采用蝶阀所节省下来的安装费用就非常可观。此外，管道系统越重，就要求管道支撑基座要坚固，因此导致整个管道系统更加昂贵。所以，考虑到阀门的重量，就能够节约整个管道系统的成本。?
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
蝶阀所占的空间大约是同等尺寸闸阀的1/6。而每增加一立方英尺的建筑物空间，就意味着成本的浪费。?
例如：公称通径10英寸的蝶阀大约是21英寸高，而公称通径10英寸的闸阀则高达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?
气密性关闭?Bubble?Tight?Shut-Off
闸阀和截止阀（金属与金属连接）的阀座不具备不透气关闭的性能。Gate?and?globe?(metal?to?metal)?seats?cannot?provide?bubble?tight?shut-off.?
Resilient?seated?butterfly?valves?are?bubble?tight?by?design.?
操作简便?Ease?of?Operation
蝶阀从开启到关闭只需要旋转1/4转（90o）。而闸阀和截止阀需要旋转很多转才能将阀门从开启状态转变为关闭状态。开启或关闭简便易行意味着不需要雇用工资太高的操作人员来操作蝶阀。?
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
一个蝶阀的成本通常只有铸铁闸阀的40%，不但购买成本低，而且安装成本也比较低。?
A?butterfly?valve?is?generally?40%?the?cost?of?an?iron?gate.?
Not?only?low?initial?cost?but?low?installation?costs?also.?
维护保养?Maintenance
由于蝶阀具有很高的六体系数和性能很好的弹性阀座，因此蝶阀具有自动清洗功能，降低了管道被拉鸡杂物堵塞的可能性。?
Properly?installed?butterfly?valves?are?virtually?self?cleaning?and?
are?less?susceptible?to?failure?due?to?trash?material?in?the?line.
