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Post by Linda on Nov 13, 2003 11:48:27 GMT -8
The illustration below shows how to clear a mouthpiece without non-return valves. Most two hose regulators had non-return valves, and to clear them, you would simply blow.
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Post by SDM on Nov 19, 2003 19:54:53 GMT -8
Most two hose regulators had non-return valves, and to clear them, you would simply blow. Linda, The non return valve was introduced to recreational diving in April 1954. All regulators produced prior to that time did not have non return valves, this would enclude the AquaLung, and some of the early DA Aqua lungs. SDM
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Post by Captain on Nov 19, 2003 20:40:53 GMT -8
With the early regulators without one way valves in the mouthpiece it was possible for the water to flood the the entire regulator and hoses. If this happens the rolling maneuver will not clear it. There are only two ways to clear a completely flooded regulator. One is to start drinking the water in the regulator in order to create enough negative pressure in the regulator to start air flow. The other is to use both hands to alternatly squeeze the inhalation hose in a pumping motion to pump the water out the exhaust valve and again create enough negative pressure to start air flow. It was a serious situation if the whole regulator flooded and much practice was needed to get the hang of doing this pumping technique. You donot want to use the air in your lungs to try and blow the water out because if it fails to clear the regulator you will have much less time to try clearing it again.
Tom
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Post by Linda on Nov 20, 2003 16:18:01 GMT -8
Most two hose regulators had non-return valves, and to clear them, you would simply blow. Dan's words. He talked, I typed. ;D He thought this information might be useful to the novice, since generally, two hose regulators in the early to mid 50's didn't have the non-return valves, but from then on, they did... Meaning no valves for a few short years, but followed by about 25 years of production WITH the non-return valves. Hence, MOST regulators will have the valves. What he meant to impart was that since most regulators have the non-return valves, most will not require using the technique in the above illustration to clear... It might be good to post the source of the illustration above in case anyone wants to refer to it for further reading or whatever... Bryan? What text is it from? (Bryan sent me the pic. Thanks, Bryan. )
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Post by SDM on Nov 20, 2003 17:45:27 GMT -8
author=Linda "It might be good to post the source of the illustration above in case anyone wants to refer to it for further reading or whatever... Bryan? What text is it from?" Linda --I will jump in -(I have a strong bibliophilic background) - FYI--Both illustrations are from "The NEW science of skin & Scuba diving" (AKA New science) published in both soft cover and hard back with a large number of revisions in 1962, 1968, 1974. The last publication in 1980 did not have this illustration. The original book "Science of skin & scuba diving," published in 1957 & 1959 had line drawings of the same activity. This book was smaller in physical size and was CNCA's first attempt to publish a comprehesive diving manual for the American public. The Science & New science were the best selling scuba diving books of all times. There will never be another scuba book that has such a great sucess in shear number of units published with a publication run of over 30 years. Because of its great popularity and large production runs It is readily avalable for very reasonable amount; one or two dollars at the local book stores and of course E-Bay. It is a book that all antique bubble blowers should have in their amentarium of resource knowledge. This does not, of course, preclude the aquisition of diving instruction books published prior to 1959, such as the Spadco 1949, Aqua lung diving 1951, LA County "Underwater recreation" (p 1954) Ellis Cross'es book (1954) Owen (1956,) Shenck & Kendals great trilogy (actually they published 4 diving books but one is impossible to find) a number of USD "Lets go diving," some of Morgan's, etc. These books also have great illustrations and would or should be invaluable addition to the retro diver's library. Hopefully they would also be used as a guide for training and aqusition of new diving skills specificly designed and developed for the mastery and taming of the beast called the double hose regulator. SDM
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Post by Linda on Nov 20, 2003 18:25:48 GMT -8
Thanks, Sam. Dan knew he'd seen it and had it SOMEwhere, but he didn't feel like thumbing through all his texts to find it for me.
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