F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
137/123
F16K 11/06 (2006.01) G01N 1/00 (2006.01)
Patent
CA 1313105
ABSTRACT A liquid metering and transfer valve assembly for a diluting system which includes a pair of stationary outer valve disc elements sandwiching a central rotatable valve disc element. The elements are coaxially aligned and mounted on a spindle. One of the outer elements has a first external loop secured thereto, said loop having a precise interior volume. An aspirator probe 18 secured to the central element. The central element carries an axial segmenting passageway having a precise interior volume. A second external loop is secured to the central element. The second loop extends outwardly, preferably radially, of said element and has a precise interior volume. Appropriate interior passageways are provided in the outer elements for directing a liquid sample in a continuous path through the valve assembly, the path including the one segmenting passageway and the first and second loops. Additional interior passageways are provided for coupling the valve assembly to sources of diluent and to exterior destinations. The central element is rotated to isolate the contents of the segmenting passageway and of the first and the second loops and diluent is fed thereto to drive the isolated contents thereof to said destinations. Only a single loading step is required to obtain three precise volumes of liquid sample. The valve assembly can be rinsed and continuous internal channels are provided for preventing any liquid from reaching the circumferential surfaces of the valve assembly.
614890
Cabrera Pedro P.
Estoque Daniel A.
Borden Ladner Gervais Llp
Coulter International Corp.
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