The electronics enclosure I’m using doesn’t have retainer rings, and I already had an incident where the air inside the enclosure expanded due to heat from electronics, and the front cap popped off when ROV returned the surface (surprisingly it survived).
I know I could just add some duct tape or something, but instead I have an idea to reduce the air pressure inside the electronics enclosure prior to a dive to compensate for potential expansion by using a vacuum pump. Of course I wouldn’t want to vacuum out all the air, since that might overheat the electronics. Getting the pressure down to 0.8bar or so should be enough.
So I’m looking for some kind of a one-way valve that allows attaching a hose to it, pumping out air one way, and then can hold a ~30 bar pressure from the end where the hose was attached, and then finally relieve the pressure after the dive to allow removal of the caps.
Is there such a valve, preferably small and reasonably priced? I found this, but as I understand it is not meant for dives, just testing.