以下为句子列表：
英文: Disc Stem Nut: Disc Stem Ring connects the disc to the stem, permitting the disc to swivel and aid in securing tight seating for trouble-free service.
中文: 阀瓣阀杆螺母：阀瓣阀杆环将阀瓣连接到阀杆上，使得阀瓣能够旋转，并有助于保证阀座地紧密密封和无故障运行。
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英文: For trouble-free longevity, it is also equipped with a ball check valve which is a third-check member, its main function being to prevent backpressure on each pump cycle from unnecessarily acting directly on the check members.
中文: 为了保证长期无故障使用寿命，这种装置还配置球型止回阀作为第三个止回阀元件，它的主要功能在于防止每个泵循环产生的反压力不必要直接作用在止回阀元件上。
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英文: It does not, however, allow your dog to have a long, healthy, trouble-free life.
中文: 但是这样却会使你的狗无法享受长寿的，健康的，无病无灾的一生。
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英文: Maintenance Services cover all activities necessary for trouble-free crane operation.
中文: 维修服务包括提供所有为保证起重机安全可靠的一切必要措施。
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英文: Oscillating displacement pump which may achieve a considerably longer trouble-free operation than a conventional diaphragm piston pump.
中文: 往复式容积泵，有比传统隔膜活塞泵长的多的无故障运行时间。
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