| abstract |
The invention relates to a chromatography pump, comprising a cylinder ( 202, 402 ) in which a piston ( 204, 404 ) is arranged for a reciprocating movement; a front element ( 208 ) provided with a cylinder head area ( 210 ) which together with the cylinder ( 202, 402 ) and the piston ( 204, 404 ) defines a cylinder space ( 212 ); an inlet valve ( 214 ) and an outlet valve ( 216 ) arranged in the front element ( 208 ); an inlet channel ( 218 ) arranged in the front element ( 208 ) between the inlet valve ( 214 ) and the cylinder head area ( 210 ); an outlet channel ( 220 ) arranged in the front element ( 208 ) between the cylinder head area ( 210 ) and the outlet valve ( 216 ). The inlet channel ( 218 ) and outlet channel ( 220 ) extend in a substantially straight direction, so that air bubbles ( 234 ) are prevented from being trapped within the inlet and outlet channels ( 218, 220 ). |