Maintenance of air separation low-temperature control valves
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Recently, a failure of the liquid oxygen extraction valve V7 caused instability in the main cooling liquid level; this issue was largely resolved after intervention by the instrument control team. Now, I would like to ask the fellow sailors: what should be done if the valve core, packing, etc. need to be replaced? Who has the maintenance documents or experience available~~ Thank you for sharing! ~
Contact the valve repair manufacturer; you can’t do it by yourself – they have the experience
That’s for sure; we still need to buy spare parts from him~~ I’m just wondering if anyone else has ever replaced the valve stem and valve core~~
As long as the unit has maintenance personnel available to carry out repairs, one can remove the valve stem and valve core from the valve cover, check the degree of wear on the valve core; if the wear is minor, it can be polished, while in cases of severe damage, a new valve core should be used. Additionally, after removing the valve core, the valve stem should be taken out to replace the packing, and care should be taken to ensure thorough degreasing during this process! There’s nothing special about it; it’s just that the material used for the valve is different from that of ordinary valves, and the valve stem is longer.
Our company has repaired this type of valve; we have even fixed high-pressure valves, as well as high-pressure throttle valves used in booster plates. By checking the degree of wear, if the damage to the valve core is not severe, it can be resolved by grinding it.
Whether it was replaced by myself or by the valve manufacturer, for components such as valve cores and valve stems of these specifications, it’s likely that the valve manufacturer is indispensable~~
The throttle valve is fine; it just doesn’t close properly. I hope core pulling can solve the problem~~
“After subsequent control system adjustments, the issue was basically resolved” – so it might not necessarily be a problem with the valve itself? Why replace the valve then?
The instrument was calibrated, but it can’t be turned off completely~~
That’s definitely the case – for replacing parts on valves, one can only turn to the original manufacturer, as the dimensions of valve bodies, valve cores, and valve stems vary from one manufacturer to another! With the spare parts available, one can replace them by themselves. First, take it apart and have a look; as long as the valve core isn’t severely damaged, it generally doesn’t need to be replaced. The most likely issue is that the components holding the valve core in place become stuck, preventing the valve core from moving and resulting in poor sealing of the valve – this is the most common problem!
The problem now is that it’s impossible to get in touch with the manufacturer’s technical department via phone~~ It’s from Zhejiang Sanfang; have you heard of them?~