Low pressure two component fluid metering, mixing and dispensing system

A two-component fluid metering, mixing and dispensing system, comprising:

• a first 4-way valve having a first port, a second port, a third port and a fourth port;
• a first pump that is to draw and supply a first fluid to the first port of the base 4-way valve;
• a second 4-way valve having a first port, a second port, a third port and a fourth port;
• a second pump that is to draw and supply a second fluid to the first port of the second 4-way valve;
• a mixing chamber having a first inlet and a second inlet connected to the fourth ports of the first valve and the second valve, respectively, and a mixture dispensing outlet;
• a first cylinder, being a double acting piston cylinder, having a first rod, a first port that is connected to the second port of the first 4-way valve, and a second port that is connected to the third port of the first 4-way valve;
• a second cylinder, being a double acting piston cylinder, having a second rod, a first port that is connected to the second port of the second 4-way valve, and a second port that is connected to the third port of the second 4-way valve;
• an actuator that is coupled to push or pull the first and second rods so as to push first and second fluids out of the first and second cylinders, respectively;
• and
• an electronic controller that, while in ready mode, a) electrically activates the first and second pumps and b) signals the actuator to push or pull the rods, in response to a dispense signal being asserted, so that fluid pressures rise to dispensing levels while the first and second fluids are flowing out of the fourth ports, and
• wherein the controller then a) electrically deactivates the first and second pumps, b) signals the actuator to stop pushing or stop pulling the rods, and c) remains in the ready mode, in response to the dispense signal being de-asserted, so that the controller remains in the ready mode while the fluid pressures drop.

A two-component fluid metering, mixing and dispensing system, comprising:

• a base valve having a first port, a second port, a third port and a fourth port;
• a base pump that is to supply a base fluid to the first port of the base valve;
• a catalyst valve having a first port, a second port, a third port and a fourth port;
• a catalyst pump that is to supply a catalyst fluid to the first port of the catalyst valve;
• a mixing chamber having a base inlet and a catalyst inlet connected to the fourth ports of the base valve and the catalyst valve, respectively, and a mixture dispensing outlet;
• a base cylinder having a first port that is connected to the second port of the base valve, and a second port that is connected to the third port of the base valve;
• a catalyst cylinder having a first port that is connected to the second port of the catalyst valve, and a second port that is connected to the third port of the catalyst valve;
• an actuator that is coupled to actuate the base and catalyst cylinders so as to push the base and catalyst fluids out of the base and catalyst cylinders, respectively;
• and
• an electronic controller having a ready mode and a dispensing mode,
• wherein in the dispensing mode the controller i) electrically activates the base and catalyst pumps and ii) signals the actuator to push or pull, in response to a dispense signal being asserted, and
• wherein in the ready mode the controller a) electrically deactivates the base and catalyst pumps, b) signals the actuator to stop pushing or stop pulling, and maintains a) and b) in response to the dispense signal being de-asserted.