Hi all,
Leaks due to O ring failures have been discussed a few times over the years on the Industrial Forum regarding Ammonia but not so much with R22. One of our clients as a few large R22 systems still in operation and R22 leaks are unacceptable. These systems are old (40 years) and were made when R22 was "cheap as chips" which certainly is not the case today. This client has a contract with Mobil and supplies its own oil. Neoprene is recommended with R22 and is readily available from a local supplier. But Neoprene dose not last when in contact with Mobil 226E oil, over time the neoprene shrinks and hardens causing no end of problems. Even the Parker O ring bible is not much help.
Hopefully someone on the Forum can provide an O ring solution. Perhaps Kalrez although poor availability. Going OEM is a challenge on 40 year old valves but probably best. From what I understand OEM O rings are not your standard "off the shelf" O rings.
Thanks