以下为句子列表：
英文: Gaskets regularly furnished in Class 150 and 300 Wedgeplug valves are corrugated soft iron of excellent strength and ductibility. Classes 600 - 1500 are ring-joint type.
中文: 压力等级为150和300的楔形塞阀门通常配置的垫圈是波纹状软铁，具有优异的强度和延展性。压力等级600-1500则采用环连接类型。
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