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| 首页Home＞美国克雷恩铸钢阀门 Crane Cast Steel Valve＞正文Text | |
| 美国克雷恩铸钢阀门 Crane Cast Steel Valves |
在各种应用上的性能 Performance In Any Application |
 美国克雷恩阀门公司 |
在任何流体处理系统中，阀门是作为控制装置：启动或停止流体流动，对流体进行调节或节流，防止倒流，或释放和调节压力。 |
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| 闸阀 Gate Valves |
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| 闸阀可作为流体双向有效的关闭阀。通常用在要求压降最小的应用场合。不建议用于节流应用，因为部分开启的闸阀所表现的流量特性并不利于精确和一致的流量控制。此外，通过阀座的高流量还可能损坏阀门。闸阀最好是全开或者全闭。 Gate valves serve as efficient stop valves with flow in either direction. They are commonly used where a minimum pressure drop is important. Throttling is not recommended because partially open gate valves exhibit flow characteristics not conducive to accurate and consistent flow control. Also, the valves may be damaged by the high velocity across the seats. They function best fully open or fully closed. |
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| 截止阀 Globe Valves |
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| 截止阀适用于节流应用。截止阀的流体特性允许精确和重复的流体控制。但是，必须注意的是避免在压降超过20%的情况下进行极端关闭节流。这样会导致噪音和振动，也可能对阀门和管道造成破坏。如果预计会发生这种情况，请咨询美国克雷恩公司。 Globe valves are ideal for throttling service. Their flow characteristics permit accurate and repeatable flow control. However, caution must be exercised to avoid extremely close throttling when pressure drop exceeds 20%. This creates excessive noise, vibration and possible damage to valves and piping. When these conditions are anticipated, consult Crane for recommendations. |
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| 旋启式止回阀 Swing Check Valves |
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| 旋启式止回阀可以防止管路中的流体倒流。大多数美国克雷恩旋启式止回阀可以安装在水平或垂直(流向朝上)的管路上。这些止回阀对流体的阻流性很低，特别适用于低速流量的应用场合。 Swing Check valves prevent reversal of flow through pipe lines. Most Crane swing check valves can be installed in horizontal or vertical, upward flow, piping. They offer low resistance to flow and are particularly suited to low velocity service. |
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| 翻转式阀瓣止回阀 Tilting Disc Check Valves |
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| 翻转式阀瓣止回阀与旋启式止回阀类似。对于大多数安装的翻转式阀瓣止回阀，由于流体倒流造成的撞击程度最小，因此噪音和振动也有所减小。 Tilting Disc Check valves are similar to swing check valves. In most installations, slamming is minimized upon reversal of flow so noise and vibration are reduced. |
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| 截止止回阀 Stop Check Valves |
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| 截止止回阀与截止阀和角阀基本上相同，但是在阀杆和阀瓣之间没有机械连接。这种阀门并不适用于节流应用，而是当两个或更多锅炉连接到一个共用集液气箱时，用于蒸汽锅炉出口管路。这种阀门的安装必须要使得压力位于阀瓣下方，当阀杆上升时，只有锅炉的压力才能够提起阀瓣，而无论锅炉压力是否超过集气箱压力。这种阀门能够防止蒸汽从集气箱倒流到锅炉里。 Stop check valves are essentially the same as globe and angle valves, except there is no mechanical connection between the stem and disc. However, they are not designed for throttling. They are used in steam boiler outlet piping when two or more boilers are connected to a common header. Valves must be installed with pressure under the disc, and when the stem is raised, only boiler pressure can raise the disc, whenever boiler pressure exceeds header pressure. They prevent steam backflow from the header to the boiler. |
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