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[轮机] Gate valve VS. Butterflay valve

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发表于 2020-5-22 17:02 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
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网友中专业人士,给普及一下,gate valve VS. Butterflay valve 的区别,适用范围,各自特点。
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龙船五分快三
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 楼主| 发表于 2020-5-22 17:03 | 只看该作者
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 楼主| 发表于 2020-5-22 17:04 | 只看该作者
What is a Gate Valve?
Gate valves, also known as sluice valves, cut off a medium in a pipeline by lifting a rectangular or round “gate” from the medium’s path. The direction of the gate’s movement is perpendicular to that of the medium’s flow.

Gate valves are cut-off valves which are only used when minimum restrictions and uniform linear flows are desired. They can either be completely open or completely closed which does not allow the adjustment of the medium flow. The medium discharge is normally complete and no residues are left in the pipes.

What is a Butterfly Valve?
Butterfly valves are also known as flap valves. They are composed of a fixed disc on the valve’s stem for closing and opening the valve. This disc rotates around the valve’s stem to regulate the flow of the medium in the pipeline. The direction of the disc’s movement is in place rotation only and requires a 90° rotation to fully open or fully close the valve.

Butterfly valves can either be used for regulating or isolating fluid flows and can control the flow easily. However, they leave residual materials in the pipeline.
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 楼主| 发表于 2020-5-22 17:05 | 只看该作者
江海直达 发表于 2020-5-22 17:04
What is a Gate Valve?
Gate valves, also known as sluice valves, cut off a medium in a pipeline by l ...

Gate Valve
Advantages
They can provide an unobstructed flow in the fully open position so pressure loss is minimal.
They are bi-directional and allow uniform linear flows.
No residues are left in the pipes.
Gate valves can withstand higher pressures compared to butterfly valves
It prevents water hammer because the wedge has a slow operation.
Disadvantages
Can only be completely open or completely closed with no allowed adjustments for the medium flow.
The operation speed is slow due to the gate valve’s high opening height.
The valve’s seat and gate will erode badly when kept in the partially open state.
More expensive compared to butterfly valves especially in large sizes.
They occupy a larger space for the installation and operation compared to butterfly valves.
Butterfly Valve
Advantages
Can be used for throttling fluid flows and can control the flow easily.
Suitable for applications under moderate to high temperature and pressure conditions.
Light-weight and compact design requiring less space for installation.
Fast operation time which is ideal for emergency shut-offs.
More affordable in large sizes.
Disadvantages
They leave residual materials in the pipeline.
The thickness of the valve’s body creates resistance which obstructs the medium flow and causes the pressure to drop even if the valve is fully open.
The movement of the disc is unguided so it is affected by the flow turbulence.
Thick liquids can prevent the movement of the disc as it is always along the flow path.
Possibility of water hammers.
Conclusion
Gate valves and butterfly valves have their own strengths and weaknesses depending on the application requirements where they are going to be installed. In general, gate valves are ideal for applications that need strict sealing only and do not need frequent operation especially when an unobstructed flow is desired. But if you need a valve for throttling purposes that occupy less space for huge systems, large butterfly valves would be ideal.

For the majority of applications, butterfly valves are more extensively used. Huamei offers high-performance butterfly valves in different end-type connection, material body, seat, and disc designs. Feel free to contact us for further questions about our products.
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发表于 2020-5-24 07:26 来自手机 | 只看该作者
这种内容何不放在专业英语版块呢
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6
发表于 2020-5-25 10:07 | 只看该作者
gate按字面就是门阀,我们也叫闸阀,阀体内封板是上下运动的。蝶阀一般是绕阀杆中轴旋转关闭的。
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