Integral pump head unit (1) closed by Jochkör (2) and integral mounting flange (3). Jochkör by having a central collar bore for receiving the fremdspülba ren ceramic piston guide sleeve (4) and the displacer space forming the pump head bush (6) made of sapphire and has comprehensive view slots (13) for providing visual accessible ness to said parts. Receiving the associated valve module (11, 12) visible and visible Kugelventilpatro NEN (36, 37) in marginal savings arrangement in vertical From (14), which depart from said longitudinal slotted openings. Ven tilmodule special design with built-in ventilation device (15). Execution of all mediumbrührter parts of sapphire and ceramics and special materials on art material base. Here, the support spring for the piston seal (7) with shell made of reinforced PTFE in Reinsttitan or design in an alternative, with O-ring made of special fluoroelastomer.
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