Title: Dosing device particularly for small quantities of liquid

Abstract: A dosing device for dispensing very small quantities of liquid includes a variable displacement piston for varying the pressure within a chamber and valves located in inlet and outlet ducts communicating with the chamber. The valves preferably comprise a disc having a circular periphery and including passages therein which are radially spaced from the central portion of the disc. This central portion engages a valve seat to close off the corresponding duct and is preferably rigid to prevent permanent deformation of the disc. The peripheral edges of the disc are received in an annular groove and are free to move radially therein.

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Inventors: de Leeuw, Jan (Akersberga, SW)

Application Number: 440090
Filing Date: 1974-02-05
Publication_date: 1976-03-09
Assignee: Autochem Instrument AB (Lidingo, SW)
Primary Class(es): 417/568 137/843
Other Classes:
US Patent Ref:

1402082	Jan, 1922	Moran	137/525.
2211212	Aug, 1940	Langdon	137/512.

Other Refs: 457,2204,479

Nov, 1936	UK
Jan, 1916	UK

Primary Examiner: Reeves, Robert B.
Assistant Examiner: Martin, Larry H.
Attorney: Larson, Taylor and Hinds