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2016-01-22 06:13:39 Post No. 7801447
Post No. 7801447
I set up about 12 vacuum manifold in a teaching lab. Regular grease on the stopcocks. Put everything up, then tested the glass stopcocks for leaks. No leaks, bubbler stops when stopcock open and vacuum works well, all is well. I go and check on that shit now months later and little to no change in the bubblers when the stopcocks are open to gas. Any clue? Only thing I can think of is the grease has thickened up in cold weather and clogs things but that sounds wrong. When I plug the bubbler it forces the gas out the open stopcock but when I stop the flow stops. Also jammed a pipe cleaner up the stopcock and that fixes it until I turn the stopcock again. The bubblers have mineral oil, mercury is not an option and the Univ Dept is too cheap to go with the nice setups of the telfon stopcocks with the black handle. Any ideas?