无码专区 丝袜美腿 制服师生_香港三级巜欲性高蜜桃成熟时类似_妺妺窝人体色www在线下载_青柠在线观看免费高清电视剧_最近新免费韩国视频资源_东京热无码av一区二区_田小娥被扒开双腿进入在线看_欧美一性一交免费在线观看_aa级一家天堂片免费观看

The reasons for the poor performance of piston rods may include the following aspects:
1. Wear or damage
Due to the high load and wear that the piston rod bears during operation, it may experience wear or damage after long-term use, resulting in poor performance.
2. Corrosion
If its surface is not subjected to appropriate anti-corrosion treatment, or if there are corrosive media in the operating environment, it may corrode, leading to poor performance.
3. Fatigue
Due to its frequent reciprocating motion during operation, fatigue may occur after long-term use, leading to poor performance.
4. Installation issues
If the piston rod is installed incorrectly or without paying attention to some details during installation, such as not applying sufficient lubricating oil, it may also lead to poor performance.
5. Material quality issues
If its material quality is not up to standard or there are quality issues, it may also lead to poor performance.