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后管线不同心，使调节阀有应力且附加到阀杆上致使阀杆与盘根的摩擦力加大。4、在调节阀行程调节不当或阀芯长时间使用造成阀芯头部磨损腐蚀。通常向下调节阀杆减小空隙达到减少泄漏的目的。5、还有一种可能就是阀芯周围受到介质的腐蚀比较严重，阀芯受介质中焊渣、铁锈、渣子等划伤产生伤痕。应取出阀芯进行研磨，严重的应该更换新阀芯。 6、阀座受到介质的腐蚀比较严重或介质中焊渣、铁锈、渣子等划伤产生伤痕，阀座与阀体间的密封被破坏。处理方法是应该取出阀座进行研磨，更换密封垫片，严重的话应该全部都更换新的。7、如果发现调节阀有摩擦，天然气压力控制阀，检修后发现摩擦不好，致使压力波动。摩擦原因是检修组装时，压盖法兰之后摩擦现象消除。8、压力调节放空阀，在一次检修时，进行了研

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