名词
中文翻译：粗粒阀
同义词：
['roughing valve', 'roughing orifice']
例句：
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1. The roughing valve is usedto control the flow of oil during theinitial stages of refining.
粗粒阀用于控制炼油初期的油流。
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2. The roughing valve was designed toprevent any leakage during the process.
粗粒阀设计用来防止过程中的任何泄漏。
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3.The roughing valve was replaced with amore efficient design after several years of use.
经过几年的使用后，粗糙的阀门被更高效的设计所取代。