Patent Document ID: 6036166
Application ID: 09160390
Patent Flag: 1

Claim One:
1. A chamber valve for use in a system for dispensing a viscous substance, the viscous substance being moved by a pump from a source thereof to a dispense point, the chamber valve, comprising: a rigid housing, a linear actuator secured to the housing, a length of flexible tubing having opposite terminal ends secured to the housing between a rigid platen and a compressing member, one terminal end of the flexible tube for fluid connection to the pump and an opposite terminal end of the flexible tube for fluid connection to the dispense point, and the compressing member operable by the linear actuator to an extended position for partially compressing the tube against the platen while the pump is operating to pump the viscous substance through the flexible tube to the dispense point and a retracted position when dispensing is stopped so that a portion of the viscous substance is withdrawn from the dispense point into the tube.