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It was a lightbulb moment. Moreover the relationship of diameters required to produce that action has been found to involve a degree of precision that careful machining techniques can just reasonably meet in actual practice. These general reference characters will be used throughout for the different embodiments of the valve together with individual reference numerals for specific parts of the valve structure of each embodiment. Usual pore sizes are 0. Neither vacuum nor superatmospheric pressure within the working passages of the valve can produce a force component tending to move the valve plug axially, as frequently happens with conventional tapered stopcocks. Use the 3-way valve when the manifold is used under closed conditions and must be vented to the atmosphere without breaking the vacuum ….
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This is the more remarkable, since the plug and bore of my improved valve structure are strictly cylindrical, with zero conical angle. Exact phrase Any word All words Any word or synonyms. After the second world war, Young — now married to a glassblower, Phyllis, and with a son, David — set up his own firm in north London making ground glass ball joints and high vacuum stopcocks. Conical stopcock plug, tightness is increased by turning the nut on the lower side. Referring now to the particular embodiment of the invention illustrated in FIGS. BOLA Stopcocks with Hose Connectors We offer 2-way stopcocks with straight bore and two hose connectors or 3-way stopcocks with T-shaped bore and three hose connectors for connecting elastic tubing e. That is, the bore, designated 10 in each embodiment is as nearly constant in diameter throughout its length as is possible to make the same.
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The small hole in the plug, directly below the plug "bore", is aligned with the lower sidearm vacuum source and evacuated. That clearance is exaggerated in the drawing for clarity of illustration. The valve body may be externally threaded coaxially of bore 52, as at 53, to receive an apertured support member 57 and clamp nut Conical stopcock plug, tightness is increased by turning the nut on the lower side. Valves have a PTFE stopcock.
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Glass high-vacuum stopcocks come in many styles and varieties. Published by the Royal Society of Chemistry. In these embodiments, while the ribs may be formed oversize, if desired, this is not absolutely necessary in order to obtain a tight seal since the imposition of outwardv pressure from within the stern will bring about the desired result. The stopcock size is determined by the diameter of the hole bore through the plug. Modular stainless steel manifolds designed to accommodate all types of filter holders and funnels for microbiological analysis or particle count in quality assurance.
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