Frans_M_Everaerts_Isotachophoresis_378342.pdf

INJECTION SYSTEMS
Fig.7.3. Exploded view of the six-way valve. 1 = Brass hexagon with screw-caps for connection of the
various parts liquid-tight to the plunger housing (2), made of Kel-F; 3 = pins for locking the plunger
housing in the brass hexagon (1); 4 = Arnite plunger with three pardel canals; 5 = stainless-steel
screw-cap provided with a ridge for the exact determination of the position of the plunger in the
plunger housing, in combination with component (6); the plunger can be switched through 60" ;
7 = handle; 8 = narrow-bore tube. The clamping device of the nanowbore tube, provided with a small
O-ring (see section 7.2.3.), should be noted.
a bore of 1 mm. This cylinder of insulating material has two collars, and on both ends
it is flat and provided with two small rubber O-rings. Again, liquid-tight connections can
be made with screw-caps.
In practice, the tap is very reproducible in sampling, especially when various people
use the instrument. For the use of syringes, more ability is needed.
It need not be explained that a shorter length of narrow-bore tube is needed for
separation, because the sample is not mixed with the leading and terminating electrolytes.
This six-way valve was very useful particularly when experiments were carried out in
which the position of the sample is important, e.g., zone electrophoresis in narrow-bore
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