Measuring and testing – Sampler – sample handling – etc. – Capture device
Patent
1997-03-07
1998-05-19
Raevis, Robert
Measuring and testing
Sampler, sample handling, etc.
Capture device
G01N 112
Patent
active
057538310
ABSTRACT:
A new lift check valve and groundwater sampling device using same is disclosed. The inventive device includes a body having a fluid flow bore extending therethrough and a first body end. A valve stem is sealingly disposed within the fluid flow bore and includes a first fluid flow bore extending from a first end and terminating at a disk integrally formed at a second end. The valve stem further includes a transverse bore extending therethrough in fluid flow communication with the first fluid flow bore and is moveable within the fluid flow bore between a first position in which the transverse bore is disposed without the fluid flow bore for fluid flow therethrough and a second position in which the transverse bore is disposed within the fluid flow bore to close off fluid flow through the fluid flow bore. A spring is provided to constrain the movement of the valve stem between the first and second positions including a first section fixedly attached to the disk and a second section extending perpendicularly from the first section and being receivable within an aperture formed in the valve stem. The second section is receivable within a peripheral recess formed in a base formed in the body opposite the first body. Alternativly a flared tab is provided to constraint the movement of the valve stem for use in single use applications.
REFERENCES:
patent: 743787 (1903-11-01), Wickson
patent: 857703 (1907-06-01), Willmann
patent: 1204635 (1916-11-01), Alexander
patent: 2486729 (1949-11-01), Beckley
patent: 2938388 (1960-05-01), Byrnes
patent: 5537881 (1996-07-01), White
patent: 5566576 (1996-10-01), Sher et al.
Anderson Claude T.
Raevis Robert
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