Repair tapered stop cocks


Glass Stopper Flask These stoppers are commonly used on volumetric flasks, separation funnels, old-style acid bottles, etc. BE AWARE, significant water may escape, the washer may be reluctant to leave, making the situation worse, the valve may pop appart, have your dingy ready , and make sure your home and contents insurance is up to date! Note - this washer is hard to buy, so if damaged, replace with ptfe tape rolled into a thin 'sausage'. Therefore, most glass systems constructed by scientific glassblowers today utilize mass-produced components. The small hole in the plug, directly below the plug "bore", is aligned with the lower sidearm vacuum source and evacuated. Plugs are standardized and interchangeable within their size.
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The one shown here gives the user a few more options in retaining the plug vacuum when opening the system to atmosphere. These connections have a range, not a set size, that is partially determined by the size of the O-Ring used. Unscrew the head and gland nut, and push out the spindle - push it down in the direction of the carrier. The glass components on this page are a representative sample of joints and stopcocks commonly found in the glassblower's shop. I will go through it top to bottom, skip the sections that dont apply to your situation.
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Poor seals and stuck joints are often the result of using connectors "dry", improper greasing, or leaching of the grease by solvents. Threaded Connectors Threaded connectors offer an alternative to the standard taper ground joint. The water flow will astonish you. Stopcock size is determined by the diameter of the hole through the plug - not the ID of the tubing attached to the stopcock barrel. Glass Components While master glassblowers know how to hand tool and grind their own glass joints and stopcocks, the time and effort these tasks require are considerable. Do all you can before you start to make sure this water wont damage anything.
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Description:These are component parts selected for their utility in any given design, then sealed onto the glassware. There should be no appreciable wear on the spindle. While master glassblowers know how to hand tool and grind their own glass joints and stopcocks, the time and effort these tasks require are considerable. The idea of this is so you get an idea of your system, so you know if your engineer is doing his job correctly, if you attempt a repair yourself,be carefull. Open and close it a few times and it should be smooth.

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