Mailing List Archive Mailing List Archive
OPV will fit into any low pressure port, I find them useful in extremely cold weather because if when you turn your tank on, at the surface, and the first stage freezes up the OPV will pop in about 1/2 second intervals releasing built up pressure, indicating that there is a problem (from my experience on repetitive dives) at this point I usually use a cup of coffee or some other means of heating the first stage so that it does not freeze up and then hurry to get into the water to avoid freeze up. The main purpose of OPV is for first stages that do not have a second stage on them, (the second stage is supposed to free flow before a hose rupture in the event of a high pressure leak), such as suit inflation or bailout bottles on commercial diving helmets, you could consider using them on pony bottles with isolator valves at the reg which I have seen in some stores recentlty. They do not improve breathing perfomance at all. By the way I live in Northern Ontario and 60% of my diving is under the ice in inland Lakes and Lake Superior since 60% of the year is sub zero. ---------- > From: Ben Greenhouse <b.greenhouse@ut*.ca*> > To: Richard Hayward <hddiver@ic*.ne*> > Cc: A.R. Greenhouse <greenhar@mu*.CI*.Mc*.CA*> > Subject: Re: Argon bottles and OPV valves > Date: November 11, 1997 7:34 PM > > Richard: > > I haven't been following this thread to closely, but if I recall, an OPV is > an overpressure release valve (right?). How do you find this useful in cold > weather? Does it just result in a more breathable 2nd stage in the event of a > first stage freeze up? I dive almost solely in Georgian Bay and Superior, so > am interested in cold water & weather equipment. Also, these valves you talk > about, can they just be fitted in to any first stage? Do they go in an LP > port? > > Thanks. > Ben > > Richard Hayward wrote: > > > Concerning OPV valves, I have readily bought them from DSI Canada in > > British Columbia for around $40.00 cn which is about $28.00 American. The > > toll free number there is 1-800-667-5449. I'm sure the american supplier of > > DSI has stock as well, I believe that they are DECA DIVING in California, > > there number is 1-805-564-1923. I find that they are also useful on first > > stages in extremely cold subzero weather, such as -30 degrees celsius, not > > uncommon in Canada. > > > > -- > > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. > > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]