國外考慮選擇蝶閥時的因素
蝶閥在獨霸10,000次以上，依舊或者保證封閉時“不透氣”。
Butterfly valves can operate for
more than 10,000 cycles and still provide "bubble tight" shut off.
壓降 Pressure Drop
若是壓降太大，會增加能量損耗。但是，該當知道的是，閥門并不是管道瑣屑產生壓降的唯１要素，招致壓降的產生還有以下要素。
管道的流體截面。
管道內壁的爭吵力。
通過部件時流向的篡改。
蝶閥的流體特點相稱于中斷閥的3倍以至更高，相稱于異樣尺寸的閘閥的7五%.
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 7五% of an equivalent size gate valve.
通用性 Versatility
蝶閥通過封閉／封閉和儉仆／平衡來對管道瑣屑中斷管教和調理。與閘閥或中斷閥比力，蝶閥具備更好的“通用性”。因為蝶閥或者采納各種輪廓處置技藝和決定彈性材料管道，所以蝶閥具備極強的化學防腐遵命。
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
輕型蝶閥的安設費用比重型鑄鐵閥門儉約的多：例如，１個公稱通徑10英寸的蝶閥重五5磅，而１個10英寸的鑄鐵閘閥重量就高達四九0磅。對于掃數管道瑣屑來說，采納蝶閥所儉約下來的安設費用就極端可觀。此外，管道瑣屑越重，就求告管道支撐基座要鞏固，因此招致掃數管道瑣屑更為低廉。所以，考慮到閥門的重量，就或者節流掃數管道瑣屑的本錢。
Installation dollars saved with lightweight
butterfly valves as compared to heavyweight cast iron valves;
i.e. a 10" butterfly may weigh 五5 pounds,
whereas a 10" iron gate may weigh 四九0 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
蝶閥所占的空間或許或許是劃一尺寸閘閥的1/6。而每增加１立方英尺的建造物空間，就意味著本錢的糜擲。
例如：公稱通徑10英寸的蝶閥或許或許是21英寸高，而公稱通徑10英寸的閘閥則高達四3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 四3" high
氣密性封閉 Bubble Tight Shut-Off
閘閥和中斷閥（金屬與金屬連貫）的閥座不具備不透氣封閉的遵命。Gate and globe (metal to metal) seats cannot provide bubble tight shut-off.
Resilient seated butterfly valves are bubble tight by design.
把持煩瑣 Ease of Operation
蝶閥從封閉到封閉只要求扭轉1/四轉（九0o）。而閘閥和中斷閥需求扭轉很多轉本領將閥門從封閉形狀轉釀成封閉形狀。封閉或封閉煩瑣易行意味著不需求應聘報酬太高的把持職員來把持蝶閥。
Butterfly valves offer 1/四 turn (九0o) 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.
本錢 Cost
１個蝶閥的本錢群體只有鑄鐵閘閥的四0%，不光購買本錢低，而且安設本錢也斗勁低。
A butterfly valve is generally 四0% the cost of an iron gate.
Not only low initial cost but low installation costs also.
掩護頤養 Maintenance
因為蝶閥具備很高的6瑣屑數和遵命很好的彈性閥座，因此蝶閥具備自動亂滌聽從，高漲了管道被拉雞雜物梗塞的或許性。
Properly installed butterfly valves are virtually self cleaning and
are less susceptible to failure due to trash material in the line.
上一條：閥門的性能 下一條：詳解安全閥分類和參數
