以下为句子列表：
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: Pacific Valves' unique injector has a double ball check protection against leakage and a positive shut-off internal valve.
中文: 美国太平洋阀门独特的注入器具有双球止回保护，防止泄露，并保护阀门内部活动部件。
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