There is not always a need to replace each piece that creates a whole piece of equipment, sometimes there is an easy fix and a quick process of repairing it. Other times do not require any repairs and the best thing you could do is replace it with a new and strong piece. Your O-ring plays a highly important role in keeping the pneumatic-hydraulic cylinder system working in top-notch condition and keeping your operations at optimal levels. But at some point in time, you will experience a problem that a seal repair kit cannot fix.
It is important to monitor the health of each part of your cylinder to ensure that it does not begin to cause extensive damage to the overall system and equipment. This can become a very costly expense if things are left to deteriorate. In many instances, you will be able to repair and lubricate the equipment to extend the lifespan of the equipment. However, they will get to a stage where the seal is no longer serving its function. This will lead to lowered performance and avoidable damage.
There are many reasons why an O-ring would fail and start to deteriorate sooner than it would normally. The reasons range from improper size or installation, or to a lack of lubrication or the use of the wrong lubrication. But first and foremost, you would notice if there are any demarcations and damage to the O-ring, so a frequent inspection will do you a service. If you notice any oil leaks or fluid leaks where the O-ring is, the O-ring is on its way out. Of course, you should also be on the lookout for any performance issues.
Any hydraulics system functions on a delicate balance. That is why you should always be doing your best to care for every component. You need to ensure that if you notice any inconsistencies, that you address them immediately. If you are in need of any fluid seals, precision rubber, and polyurethane products, be sure to contact Fuzion Trading.
I am assuming you are talking about servicing one's regulator, including the first stage. Depending on the make and model it will have a number of O rings and other parts that need to be replaced, lubed, and adjusted .... Anyway, all of this should of been covered in your OW class. The general reccomendation is one time per year. There are a number of people, however, who consider that overkill. I do mine every year...or at least close to every year.
If you are talking about the valve on a tank then I go with when it looks old, crappy, does not allow a seal, or I think it might be a good idea. A few replacements in your dive bag is always a great idea.
Hope that helps.
Yes I intend to have my both 1st and 2nd stage serviced yearly, I bought used and had them serviced before I ever used them, but I was talking about the O ring you can see on first stage which I thought is on the tank valve...