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• 13:28, 29 May 2024 JohnKoss3351028 talk created page Can A Double Ball Valve Be Used To Diagnose Cardiac Masses (Created page with "<br>A double ball valve (or a "double boiler") is a device which prevents carbon monoxide and other gaseous emissions from entering the vent duct by having a valve which opens and closes by itself in response to pressure changes in the vent. It was originally developed for use in venting and nonneoplastic causes of air sacs, but is now found in many different applications. This device is particularly useful for relieving pressure on the left upper arm, the lower back, th...")