Hmm, never really considered this, but all of my tanks are new within a few years, so perhaps I'll make a mental note to have the valves serviced when I eventually need to hydro them.
How often do you rebuild your tank valve?
- Thread starter JEScholz
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I don't know about servicing the the valves, but according to what I have read the burst disc should be replaced at the time of the hydro. Read the IMPORTANT. "Sherwood Scuba Cylinder Valves Assembly & Maintenance Guide").
OMyMyOHellYes
Contributor
Waking a zombie - question came up as part of negotiation on purchase of old tanks from a neighbor.
In the PSI/PCI inspector class, it was pointed out that burst disk assemplies need to be replacced at every hydro interval (if not sooner).
It was discussed that the valve manufacturers required as much, if not full service of the valve.
My takeaway point was that valves are required to be serviced every five years.
The 2018 Thermo Valve Service Manual (p. 5) says:
Surprisingly (!), exact same verbage is in the 2020 XS Scuba Valve Service Manual (p. 5 (Surprisingly the same page reference!)).
From the Thermo Service Manual (p. 18):
I have a query out to San-O-Sub for any guidance they may have (not been able to find a San-O-Sub/Blue Steel service manual online as of current time).
OMMOHY
In the PSI/PCI inspector class, it was pointed out that burst disk assemplies need to be replacced at every hydro interval (if not sooner).
It was discussed that the valve manufacturers required as much, if not full service of the valve.
My takeaway point was that valves are required to be serviced every five years.
The 2018 Thermo Valve Service Manual (p. 5) says:
Surprisingly (!), exact same verbage is in the 2020 XS Scuba Valve Service Manual (p. 5 (Surprisingly the same page reference!)).
From the Thermo Service Manual (p. 18):
I have a query out to San-O-Sub for any guidance they may have (not been able to find a San-O-Sub/Blue Steel service manual online as of current time).
OMMOHY
I by default change the burst discs on customer's tank at hydro. If they choose not to do so, that is fine. A lot of my customers are buying trimix and typically want their tanks full. If a disc blows at 3500 while I am filling, you get a bill for two fills, one before the disc went and another bill to fill them after it blew. To most, it is worth the $5 I charge to change the disc at hydro. Full valve service is up to the customer, if the valve is difficult to turn when under pressure, or the valve turns a half turn before opening, I will recommend they get their valve serviced.
As to my own equipment, it gets serviced as needed, the burst discs get replaced at hydro.
As to my own equipment, it gets serviced as needed, the burst discs get replaced at hydro.
AfterDark
Contributor
Other than having my old Scubapro adjustable J valve with the fill indicator fixed for leaking (as they were known to do) I don't recall ever having a valve "rebuilt". Every year I change the O-ring where the reg connects (yoke) and every 5 years the tank O-ring post hydro. I also do not recall ever having a burst disk failing; I think I had one changed once on a used valve I bought. I'd bet some of the burst disks I have are over 50 years old.
Voted "when it fails" as the closest option to "rebuild the whatnow?!"... This is DIN country so no burst disks or external O-rings, but I suppose there are still components inside that could require service, and the tank O-ring itself.
Gone for diving
Contributor
Never until it leaks, unless it's a new used tank to me, and its abit questionable,
Then I will change the shaft sealing oring,
Everything else is normally fine, tiny bit of lube, and done,
Then I will change the shaft sealing oring,
Everything else is normally fine, tiny bit of lube, and done,
Since this post has been resurrected, I went ahead and voted. I selected OTHER.
I never service my valves, I replace them. Valves today are cheap and when you compare a full rebuild with burst disk at hydro, it is just as affordable to replace the valve. I'd rather have an entirely new valve every 5 years than trust an unknown-to-me tank monkey with servicing them. I used to do it myself. I moved away from doing that when I moved to Florida. Now that I dive saltwater exclusively, I just replace my valves at hydro and either sell or recycle the old valves.
I never service my valves, I replace them. Valves today are cheap and when you compare a full rebuild with burst disk at hydro, it is just as affordable to replace the valve. I'd rather have an entirely new valve every 5 years than trust an unknown-to-me tank monkey with servicing them. I used to do it myself. I moved away from doing that when I moved to Florida. Now that I dive saltwater exclusively, I just replace my valves at hydro and either sell or recycle the old valves.
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