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- To test for tightness of second check Valve. 检测第二止回阀的密封性。
- Second check assembly, Cover O-ring and Sensing passage O-ring. 第二止回阀总成,阀盖O形环和感应通道O形环。
- Second check module, Check module O-ring and Disc elastomer. 第二止回阀模块,止回阀模块O形环和阀瓣合成橡胶。
- Service the second check valve using steps 2 through 12. 按照第2步至第12步维修第二止回阀。
- If water drips continuously from vent, second check is leaking. 如果水从排气口持续滴漏，则第二止回阀泄漏。
- Kit Includes: First and Second Check modules, O-rings and spacers if needed. 组件包括：第一和第二止回模块，O形环和垫片以备需要。
- Open TC #4, then open VA. If relief valve does not drip, record second check valve as "close tight". 开启测试旋塞4号，然后开启VA。如果安全阀没有滴漏，则记录第二止回阀为“密封紧密”。
- Specifies a range check value. 指定范围检查值。
- Reassemble the check valve module in the reverse order. Service is identical for both the first and second check valves. 按照相反的顺序安装止回阀。维修第一和第二止回阀的方法相同。
- For purposes of discussion, these identifiers and classifications are called checked value sets. 为了便于论述，下面这些标识符和分类类别被统称为”已校验值集”。
- The second check is fouled during emergency backflow or resulting from a water hammer condition. 第二止回阀在紧急回流期间受到污染,或由于水锤现象而导致。
- For purposes of discussion,these identifiers and classifications are called checked value sets. 为了便于论述，下面这些标识符和分类类别被统称为”已校验值集”。
- Remove first check module from module adaptor, and repeat above procedure with second check module. 从模块适配器上拆卸第一止回阀模块，对于第二止回阀模块重复上列步骤。
- Used as part of the process required to establish a new checked value set and to retire a checked value set. 这通常在这样一个流程中出现:当需要建立一个新的已校验的值集，而要废弃另一个已校验的值集的时候，这个tmodel类别会以流程的一部分出现。
- Bronze body construction, silicone rubber disc material in the first and second check plus the relief valve. 青铜阀体结构，硅橡胶阀瓣材料，位于第一和第二止回阀以及安全阀内。
- Open VA then TC #4. If relief valve does not drip, record second check valve as "closed tight". 开启VA，然后开启测试旋塞4号。如果安全阀没有滴水，则记录第二止回阀为“关闭紧密”。
- Kit consists of: Second check assembly O-ring, Disc holder assembly, Cover Oring and Sensing passage O-ring. 组件包括：第二止回阀总成O形环，阀瓣固定器总成，阀盖O形环和感应通道O形环。
- Second check must be drip tight when pressure is applied to downstream side of valve. 当阀门下游一侧出现压力时,第二止回阀必须是无滴漏。
- Kit consists of: First & second check, Tailpiece O-ring, Adapter O-ring and Body O-ring. 组件包括：第一和第二止回阀，尾管O形环，适配器O形环和阀体O形环。
- Kit consists of: First &second check, Tailpiece O-ring, Adapter O-ring and Body O-ring. 组件包括：第一和第二止回阀，尾管O形环，适配器O形环和阀体O形环。
