Leaving burst disc on valve during ultrasonic cleaning?

[Scubadan_cr]

Hello everyone,

Seeking some help with this topic. Starting to perform maintenance on my cylinder valves. The question is, would there be a problem if I leave the burst disc on the valve during ultrasonic cleaning? The reason I would like to do it is because this is the first time I perform maintenance on the valves (it's been a year since they were purchased), and I am hesitant to remove the safety assembly and mess up the torque values to which they were put from the manufacturer.

Thank you very much!

 

[Fibonacci]

If the valve is only a year old, the burst disc is likely in good condition so I'd leave it in.
Yes, if disassembled you need a new disc and washer ideally torqued to correct specs... usually 100 inch/lbs

For an older valve with unknown history I'd strip the valve completely and US clean, installing a new burst disc and washer.
I got quite a surprise when I did that!
Check that burst disk...

 

[JackD342]

Were they purchased new or used? If new, have they seen enough abuse that they require service? At least for Thermo and Sherwood, the overhaul is at 5 years not 1 year. At which point the burst disk should be replaced. Either way, I would NOT leave anything partially assembled in the cleaner. If the valve uses a copper crush gasket, always replace it if disassembled.

 

[Scubadan_cr]

Were they purchased new or used? If new, have they seen enough abuse that they require service? At least for Thermo and Sherwood, the overhaul is at 5 years not 1 year. At which point the burst disk should be replaced. Either way, I would NOT leave anything partially assembled in the cleaner. If the valve uses a copper crush gasket, always replace it if disassembled.

Thank you very much for your answers, Fibonacci/JackD342.

They were purchased new and have not been abused, just regular use in saltwater. Valves are Thermo Pro. I was using the yearly service interval as it was suggested in the service manual https://static1.squarespace.com/sta...0202c9/1530226932221/Thermo-Valves-Manual.pdf

But I'm all ears to further details on why you say 5. The valve does have a copper crush gasket, I'd love to learn more about the importance of this piece and why it must be replaced if removed. Also, do you have any details on why a hard no on a partially assembled valved in the US Cleaner?

 

[JackD342]

Thank you very much for your answers, Fibonacci/JackD342.

They were purchased new and have not been abused, just regular use in saltwater. Valves are Thermo Pro. I was using the yearly service interval as it was suggested in the service manual https://static1.squarespace.com/sta...0202c9/1530226932221/Thermo-Valves-Manual.pdf

But I'm all ears to further details on why you say 5. The valve does have a copper crush gasket, I'd love to learn more about the importance of this piece and why it must be replaced if removed. Also, do you have any details on why a hard no on a partially assembled valved in the US Cleaner?

Read page 5, where it tells you to evaluate annually, and only service if one of the 8 listed trouble signs are observed.
The copper crush gasket has already been crushed once. Likely to leak if used again. I can only speculate on what would happen if you left the burst disk in during the ultrasonic cleaning, but I have never heard any scuba gear that even suggests the possibility of cleaning without disassembly. Could freeze the parts together, could weaken/corrode the disk itself, could deteriorate the soft part of the disk assembly. MFGR doesn't say not to, because they don't imagine a need to say it.

 

[Scubadan_cr]

Read page 5, where it tells you to evaluate annually, and only service if one of the 8 listed trouble signs are observed.
The copper crush gasket has already been crushed once. Likely to leak if used again. I can only speculate on what would happen if you left the burst disk in during the ultrasonic cleaning, but I have never heard any scuba gear that even suggests the possibility of cleaning without disassembly. Could freeze the parts together, could weaken/corrode the disk itself, could deteriorate the soft part of the disk assembly. MFGR doesn't say not to, because they don't imagine a need to say it.

Thank you very much for pointing this out, I see I misread that guideline in the manual! The good news is, I guess I wont need to service that many valves, the bad news is that I already purchased a bunch of service kits.