Abstract: A peristaltic pump includes pivotal reaction members having reaction surfaces formed thereon for cooperation with a rotor in effecting peristaltic pumping action. The pump includes an improved adjustable tube-gripping assembly for securing a fluid flow tube of any size within a predetermined range in a predetermined position relative to the pump with only a minimal decrease of interior cross-sectional area. The preferred tube-gripping assembly includes a fixed gripping member and a movable yoke, each having notches formed therein for receiving the tube. A latch system for maintaining the pivotal reaction members in closed position applies relatively evenly distributed closing force along the joint between the reaction surfaces.

Abstract: There is disclosed a novel dispensing unit and system for the controlled, metered dispensing of one or more liquid products. The unit which serves to provide an important part of the system is designed for use with an arrangement wherein pressurized liquid products are delivered to the unit for controlled, metered dispensing. The unit is characterized primarily by the employment of metering chambers defined partially by flexible diaphragms. In conjunction with each said chamber, there are provided an inlet and outlet passage arrangement and a valve arrangement for controlling the supply and discharge of liquid product from said metering chamber. The unit includes a selectively operable control arrangement provided for opening and closing the valving arrangement, and also alternately pressurizing and venting the metering chamber diaphram with respect to a pressurized medium.