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浮球阀的维修 | 2011-5-13 17:04:00
浮球阀的维修
浮球阀在工作中出现故障是由于腐蚀、虚焊、焊缝开裂等造成浮球阀泄漏破裂。另外由于容器内液面波动频繁,引起浮球阀启闭频繁,阀芯与阀座磨损,导致阀不能全开或泄漏。
1浮球阀卡死
1)赃物卡死或过滤器堵塞、损坏:由于过滤器损坏,使系统中没有清理彻底的焊渣、铁屑等脏物进入浮球阀,卡死阀的转动部位,使浮球不能浮起和落下。发生这种故障后,应拆卸清洗浮球阀,并检查和修理过滤器。为避免此种故障重复发生,应定期检查和清洗过滤器。
2)浮球破裂:焊缝开裂或材料缺陷出现小孔导致制冷剂进入浮球内,浮球不能浮起,阀不能关闭。修补漏点,然后进行泄漏检查,浮球的水压试验压力为表压1.4MPa。
3)阀芯与阀座磨损严重:长期使用的浮球阀动作频繁,造成阀孔椭圆、锥度变形,使阀不能开足。修理时可修复阀孔,若不能修复则更换。
2浮球阀直通,不能关闭或节流
1)浮球连杆与针阀或柱型阀脱开:多数因为调整螺丝处的开口销折断脱落引起。检查时应找出脱落的销子,更换新销子。不允许使用旧销子或铁丝、铁钉代替。
2)浮球脱落:由于材料缺陷或制造原因,使连杆在螺孔处的断裂,造成浮球脱落,使阀处于直通状态,严重时会造成机组的湿冲程,应及时更换。

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