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Graveyard Diver scuba cylinder valve service

Graveyard DIver SCUBA valve service repair burst disk replacement
Do you see the dangerous problem with this SCUBA cylinder valve?   If your answer was "no" then you are correct.


The SCUBA cylinder valve is said to be the most neglected piece of SCUBA dive gear a diver owns.  Many SCUBA divers seldom give a second thought to the valves on their cylinders as long at they turn the knob and it opens and closes.  Oftentimes, the SCUBA valve only gets any thought at all except in the annual visual inspection, and then it's a visual inspection of the threads, O-ring replacement, and a quick glance-over.

Unlike many pieces of SCUBA gear, the most critical parts of a SCUBA cylinder valve are concealed on the inside, not visible from the outside. Valve packings wear, internal O-rings get abraded by friction and worn by foreign particles that get inside during normal use, valve stems get bent, nylon washers wear, seats get damaged from over tightening, and the internal surfaces can get exposed to corrosive sea water
from divers who breathe their cylinders empty during diving, and water from careless fill station operators who fill cylinders in water tanks.  Graveyard Diver considers the SCUBA cylinder valve an important piece of life support equipment because, well, if it doesn't work you may not be able to breathe underwater!  

Graveyard Diver recommends your valve be fully serviced at each 5-year hydrostatic requalification, or sooner if you experience obvious problems such as a valve handle that is difficult to turn, a valve knob that "wobbles" when you turn it, if your cylinder has fallen and the valve bumped, or if you see bubbles coming from your SCUBA valve underwater.  Don't confuse bubbles coming from some first stage regulators, as some manufacturers use a bleeding system in their first stage regulators.  This is a normal function of some first stage regulators.

During the Graveyard Diver cylinder valve service, your valve will be removed from your SCUBA cylinder.  The valve threads will be inspected for corrosion, cracks, galling, or other damage.  The bonnet nut will be removed and the valve stem inspected to make sure it isn't bent and the threads inspected for damage and wear.  The valve seat will be replaced, washers replaced, internal O-rings replaced, and the bonnet but inspected and replaced if necessary.  The body of the valve will be cleaned in an ultrasonic cleaner with mild acid.  After all internal parts have been cleaned, inspected, and replaced where necessary, the valve will be reassembled, the tank-to-valve and valve-to-regulator O-rings replaced, and the valve threads lubricated with the proper lubricant.  The burst disk (PRD) will be replaced and tightened to the proper torque specified by the manufacturer.  Finally, the valve will be reinstalled on the cylinder at the proper torque according to the manufacturers specification and the cylinder checked to ensure there are no leaks.

Unfortunatley, many divers elect to attempt to service their own valves from parts diagrams available on the Internet, but may not be properly trained and may not know what to look for.  When it comes to your life support equipment, insist that your cylinder valve technician be formally trained. How can you tell if your valve technician is formally trained?  

  1. Look for a PSI certificate.  It should be prominently posted and should have the technicians name, date of the valve technician course, and have a "Valve Service Technician" certification number on it.
  2. Ask a lot of questions.  "What are you looking for? How can you tell? How did you learn this?" His answers should be clear and confident.   If he doesn't have the time to explain to you what he is doing to your valve, then you should also ask yourself whether he has the time to do the job right.
  3. Ask for replaced parts to be returned to you.  There is no use for worn, damaged, and used valve parts.  Your valve technician should be glad to return them to you for your own informal inspection and for proof that he actually replaced what he claimed he did. After all, he's just going to throw them away, and they belong to you anyway.



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Graveyard Diver ultrasonic lean valves rebuilt serviced

Graveyard Diver has built our cylinder service around servicing our customers.  We don't sell scuba cylinders, provide charter services, sell SCUBA gear, or offer SCUBA certification classes.  Our focus is SCUBA cylinders and valves.  We pride ourselves on quality of workmanship and maintaining the highest level of education available in the SCUBA industry today.  We are certified by PSI-PCI, the SCUBA industry "gold standard" when it comes to cylinders and valves.  

We don't do "valve checks" and call it a valve service, we do total rebuilds, which means your valve is completely disassembled and ultrasonically cleaned, lubricated, and reassembled with all new factory parts.  While some dive shops will hand you back your valve and an invoice, Graveyard Diver provides you with an itemized list of every part replaced and a written description of everything done to your valve. This is the only way that you can be sure that your valve will continue to give you the performance you expect.  Graveyard Diver service department is equipped with the knowledge and tools to insure the quality we strive to achieve.  We have spared no expense when it comes to the various tools and supplies needed to properly perform cylinder and valve service.

When it comes time for your 5-year SCUBA cylinder requalification, insist that your valve be serviced by Graveyard Diver.  Don't be mislead by the "Yeah, we'll take a look at it"  that you may get from some dive shops.   You deserve the quality of service from your cylinder/valve technician that you are paying for.  The benefit is the confindence you'll have from knowing your life support equipment was serviced by a competent, knowledgeable, and formally trained cylinder and valve technician.


PSI-PCI sscuba cylinder visual inspection