美標鑄鋼閘閥與美標球閥是兩種常見的美標閥門，它們在結構、原理、性能及應用場景等方面存在一些區別，具體如下：

American standard cast steel gate valves and American standard ball valves are two common types of American standard valves. They have some differences in structure, principle, performance, and application scenarios, as follows:

一、結構原理

1、 Structural principle

美標鑄鋼閘閥：通常采用閘板作為啟閉件，閘板沿著閥座中心線的垂直方向移動來實現閥門的開閉。閘板與閥座之間的密封面可以是平面或錐面，通過閘板的升降來控制流體的通斷。這種結構使得閘閥在全開時，流體通道幾乎沒有阻礙，流阻較小。

American standard cast steel gate valve: The gate is usually used as the opening and closing component, and the gate moves vertically along the centerline of the valve seat to achieve the opening and closing of the valve. The sealing surface between the gate and the valve seat can be flat or conical, and the fluid flow is controlled by the lifting and lowering of the gate. This structure ensures that when the gate valve is fully opened, there is almost no obstruction in the fluid channel and the flow resistance is relatively small.

美標球閥：以球體為啟閉件，球體上有圓形的通孔，通過旋轉球體來實現閥門的開閉。球體開啟時，流體可以直接通過球體上的通孔，在全開狀態下，流道完全暢通，流阻極小，且具有良好的密封性。

American standard ball valve: It uses a ball as the opening and closing element, with a circular through-hole on the ball. The valve can be opened and closed by rotating the ball. When the sphere is opened, fluid can directly pass through the through holes on the sphere. In the fully open state, the flow channel is completely unobstructed, with minimal flow resistance and good sealing performance.

二、性能特點

2、 Performance characteristics

美標鑄鋼閘閥：具有較好的節流和截止功能，關閉狀態下密封性較好，能夠承受較高的壓力和溫度。不過，閘閥的啟閉速度相對較慢，且在頻繁開啟和關閉的過程中，閘板與閥座之間的密封面容易磨損，影響閥門的使用壽命。

American standard cast steel gate valve: It has good throttling and shut-off functions, good sealing performance in the closed state, and can withstand high pressure and temperature. However, the opening and closing speed of gate valves is relatively slow, and during frequent opening and closing, the sealing surface between the gate and valve seat is prone to wear, which affects the service life of the valve.

美標球閥：操作簡便，開關迅速，只需旋轉 90° 即可實現全開或全關。球閥的密封性能優異，無論是在開啟還是關閉狀態，都能有效防止介質泄漏。同時，球閥還具有良好的耐磨性能，適用于各種不同類型的流體介質，包括一些含有顆粒或雜質的介質。

American standard ball valve: easy to operate, quick to switch, only need to rotate 90 ° to achieve full open or full close. The sealing performance of ball valves is excellent, and they can effectively prevent medium leakage in both open and closed states. At the same time, ball valves also have good wear resistance and are suitable for various types of fluid media, including some media containing particles or impurities.

三、應用場景

3、 Application scenarios

美標鑄鋼閘閥：常用于一些對流量調節要求較高、需要精確控制流體流量的場合，如化工、石油、天然氣等行業的管道系統中，用于截斷或接通介質流。此外，在一些高溫、高壓的管道系統中，閘閥也能發揮其良好的密封性能和承壓能力。

American standard cast steel gate valve: commonly used in applications that require high flow regulation and precise control of fluid flow, such as pipeline systems in industries such as chemical, petroleum, and natural gas, to cut off or connect medium flow. In addition, in some high-temperature and high-pressure pipeline systems, gate valves can also demonstrate their excellent sealing performance and pressure bearing capacity.

美標球閥：廣泛應用于需要快速啟閉的管道系統中，如給排水系統、消防系統、燃氣系統等。由于其良好的密封性能和耐磨性能，也常用于一些對介質泄漏要求嚴格的場合，以及含有固體顆粒或雜質的流體輸送管道中。

American standard ball valve: widely used in pipeline systems that require quick opening and closing, such as water supply and drainage systems, fire protection systems, gas systems, etc. Due to its excellent sealing and wear resistance, it is also commonly used in situations where strict requirements are placed on medium leakage, as well as in fluid transport pipelines containing solid particles or impurities.

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