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1. The technician needs to tighten the valve adjusting nut to ensure proper functioning of the system.
技术人员需要拧紧阀门调节螺母，以确保系统的正常运行。
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2. The valve adjusting nut was replaced after a few months of use, as it had become worn out.
在使用几个月后，阀门调节螺母被更换了，因为它已经磨损了。
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3. During maintenance, the technician found that the valve adjusting nut was slightly loose and needed to be tightened further.
在维护过程中，技术人员发现阀门调节螺母略微松动，需要进一步拧紧。