Patent ID: 6126039
Filing Date: 2000-10-03
Classification: B01F,B05C,B29B,F04C

Abstract:
A dispense head for a plural pump dispensing system, comprising:a body including chambers, exit passages from the chambers, respectively, and inlets to the chambers, respectively;pumps coupled with the inlets, for communication with the inlets, respectively;cylindrical bellows within the chambers, respectively, each including a first end and a second end, the first end being sealed to the body;rods, each including a sealing end, the rods extending slidably into the chamber through the first end of the bellows and being sealed to the second end of the bellows;an actuator coupled to the rods, the actuator having a first extreme position with the sealing ends of the rods extending to the body at the exit passages to close the exit passages and a second extreme position with the sealing ends of the rods displaced from the body at the exit passages to open the exit passages;a controller coupled with the pumps and with the actuator, the controller selectively simultaneously stopping the pumps and driving the actuator to the first extreme position and selectively simultaneously starting the pumps and driving the actuator to the second extreme position.