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Method and apparatus for precision squeeze tube valving, pumping and dispensing of work fluid(s)

  • US 5,035,350 A
  • Filed: 08/22/1990
  • Issued: 07/30/1991
  • Est. Priority Date: 02/21/1989
  • Status: Expired due to Fees
First Claim
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1. The method of precision positive shut off of a flowable work material from a source operable to cause the flowable work material to move through a dispensing outlet and having a flexible tube means intermediate the dispensing outlet and the source, said flexible tube means having an inlet end, an outlet end, an outlet movable surface and a compensator movable surface, each of said outlet movable surface and said compensator movable surface being operable for pinchingly engaging and disengaging said flexible tube means between the inlet end and outlet end, said compensator movable surface being larger than said outlet movable surface comprising the steps of:

  • a) with said compensator movable surface being in a partial pinching position, moving the outlet movable surface from a flow permitting position to a complete tube pinching position to prevent flow of material from said source and to prevent egress of work material in said tube means out said outlet end,b) substantially simultaneous with step (a), moving said compensator movable surface in a direction opposite to the movement of outlet movable surface and a distance proportional to the relative sizes of said outlet movable surface and said compensator movable surface, andc) moving said outlet movable surface from said complete tube pinching to prevent flow position to said flow permitting position while substantially simultaneously moving the compensator movable surface to its original partial tube pinching position whereby the volume of flowable work material in said tube means displacingly moved by outlet movable surface is offset by the tube internal volume change caused by movement of the compensator movable surface thereby preventing surge or suckback of work material through said outlet end when said outlet movable surface moves toward its pinching off of flow position or flow permitting position without ballooning of the tube means.

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