Pump arrangement which includes axially extending cylindrical ring noses on coned rings with a centering ring and seal ring radially of the face wherein two of the ring nose are oppositionally directed and laid together

A pump, comprising, in combination, a fluid containing working chamber (50) with inlet- and outlet- valves (69, 70) formed between at least one first hollow coned ring element (1, 11) and at least one closing wall portion (6, 7, 66, 1, 11) with said hollow coned ring and said chamber subjected to periodic axial compression and expansion by an arrangement which includes a reciprocating piston (66) which at least indirectly subjects said coned ring element and thereby said working chamber to periodically alternating compression and expansion,

• wherein an improvement is provided and includes the provision of a substantially cylindrically shaped, axially extending, ring nose provided on the radial outer portion of said coned ring element, extending in axial direction oppositionally directed relative to the axial direction of the cone of said coned ring element with said axially extending ring nose (12) ending in an axial end face (13), whereby a meeting face (23) is formed between said end face (13) and the face (13) which it meets,
• wherein a second coned ring element is laid with its radial outer portion and thereby with its end face of its axial extension against the end face of said axial extension of said first coned ring element to form by both of said end faces (13) a seal seat (23) for a fluid containing chamber (50) between said two coned ring elements,
• wherein a centering ring (20) of rigid material and of a radial extension of a small fraction of the radial extension of said coned ring elements is assembled radially of said seal seat (23) and thereby between portions of said coned ring elements (1 and 11), while a plastically deformable seal ring (26) is assembled radially inwardly of said centering ring in the direction remote from said seal seat, and,
• wherein said centering ring meets portions of faces of said ring noses of said coned ring elements and portions of the axial end faces of the coned portions of said coned ring elements.