Precompression system for a liquid dispensing device and method of assembling such precompressed system

  • US 8,256,648 B2
  • Filed: 05/02/2007
  • Issued: 09/04/2012
  • Est. Priority Date: 03/24/2007
  • Status: Active Grant
First Claim
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1. A precompression system for a liquid dispensing device having an inlet and an outlet, comprising:

  • a pump chamber including a piston movable in the pump chamber for drawing liquid through the inlet and discharging the liquid through the outlet; and

    a valve chamber including a valve member disposed between the pump chamber and the outlet and being operable to allow liquid in the pump chamber to reach the outlet only after a predetermined pressure is established in said pump chamber and to stop liquid from reaching the outlet when the pressure in the pump chamber falls below said predetermined pressure,wherein the valve chamber has an inlet end in fluid communication with said pump chamber, an outlet end in fluid communication with the outlet and a valve seat arranged between the inlet end and the outlet end and having an opening extending therethrough,wherein the valve member comprises an elastic diaphragm normally closing the valve seat opening and including a concave surface facing the valve seat opening and in fluid communication with the pump chamber and a convex surface in fluid communication with atmospheric pressure, andwherein the valve member includes a sleeve surrounding and holding the outer periphery of the diaphragm, said sleeve being provided within said valve chamber, said sleeve having a lengthwise dimension that is substantially perpendicular to the diaphragm, and greater than a corresponding depth of the valve chamber, such that the valve member and sleeve fit into the valve chamber in a compressed manner.

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