以下为句子列表：
英文: Crane globe valves are highly efficient for services requiring frequent operation and throttling when pressure drop across the valve is about 20% of inlet pressure.
中文: 当通过阀门的压降为管路压力的20%左右时，美国克雷恩截止阀就能够高效应用在频繁操作和节流的应用场合。
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英文: Factory installed V-port seat insert available for metering or throttling service (page 10).
中文: 可提供工厂安装的V形端口阀座镶嵌件，适用于计量或节流领域（参阅第10页）。
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英文: Gate valves are normally used for on-off service and are not recommended for throttling service.
中文: 闸阀通常应用于开启-关闭场合，不推荐用于节流应用。
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英文: Gate valves are normally used for on-off service. They are not recommended for throttling service.
中文: 闸阀通常用于启闭应用场合。不适用于节流应用场合。
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英文: Gate valves are not designed for throttling service.
中文: 长期处于未全开状态通常会损坏阀座表面。
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