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The resin components enter the proportioning device under pressure from pumps or pressurized vessels. (a). Under pressure, the separate components flow through open inlet valves (b) into metering cylinders (c), exerting pressure against the metering pistons (d). The pistons extend under the fluid pressure until they reach the main air cylinder end cap (e). As the pistons bear against the end cap, urethane pads on the piston ends seal off the flow of air venting from two holes. Once both of these vents are sealed, the Fill Sensor sends a signal allowing the dispense cycle sequence to continue. This signal energizes the Coco™ Module to close the inlet valves (b) and open the outlet valves (f) to allow the resin components to exit under the pressure exerted by the main air cylinder (e) pushing against the metering pistons (d). The components merge at the Tempest Mixer (g). When the dispense stroke is completed, the Coco module closes the outlet valves (f) and opens the inlet valves (b) to allow the metering cylinders (c) to refill as the main air cylinder returns. The system is not able to continue the dispense cycle sequence unless the Fill Sensor confirms that both metering cylinders are filled. Both of the vents in the end cap must be sealed by the arrival of the material pistons to confirm the complete filing of both of the metering cylinders This function is important, because if either metering cylinder does not fill completely, the proportioning will be off ratio. |
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The sensor valves work like this: The pneumatic control circuit that triggers the system to dispense is routed through conduits within the main air cylinder end cap. Two holes vent this circuit so that pressure cannot build within it unless both vents are sealed off by the impingement of the urethane pads on the ends of fully extended metering pistons. Once both vents are sealed, (confirming the arrival of both pistons) pressure quickly builds in the air circuit, triggering a dispense cycle. This signal energizes the Coco™ Module to close the inlet valves (b) and open the outlet valves (f) to allow the resin components to exit under the pressure exerted by the main air cylinder (e) pushing against the metering pistons (d). The components merge at the Tempest Mixer (g). When the dispense stroke is completed, the Coco module closes the outlet valves (f) and open the inlet valves (b) to allow the metering cylinders (c) to refill as the main air cylinder returns. |
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The Coco™ Module, a product of five years of research and development, employs a simple linear motion to synchronize the opening and closing of the fluid valves in such a manner that they cannot overlap in the open position. Regardless of operator error or malfunction of other components, flawless valve sequencing is certain. This is how it works.
Once the sensor confirms that both metering cylinders are filled, the Coco™ air cylinder is energized to retract the cam pusher. As the pusher retracts (Frame A), it cams the lower flipper 90 degrees to close the inlet valves, and then continues its travel to cam the upper flipper to open the outlet valves. The same signal that triggers the opening of the outlet valves energizes the main air cylinder to advance, pressing the metering pistons into their respective cylinders, thereby forcing the fluid components to flow simultaneously from the cylinders through the coco outlet valves. Following completion the dispense cycle, Coco™ extends its pusher (Frame B) to close the outlet valves and open the inlet valves, allowing the metering cylinders to refill. Once both metering cylinders are filled, the Coco™ air cylinder is energized to retract the cam pusher. As the pusher retracts (Frame A), it cams the lower flipper 90 degrees to close the inlet valves and then continues its travel to cam the upper flipper to open the outlet valves. Note that it is impossible for the inlet or outlet valves to open until after the opposite valves close. Coco™ cannot make a mistake. The product is secure from ratio error due to valve overlap. Coco™ valve sequencing has also eliminated a maze of fluid valves, actuators, control valves, and tubing otherwise required to route fluid components through a metering system. Now, a single modular assembly suffices in CD dispensers. |
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Mechanically Actuated Ball Valves control the flow of the resin. The Coco™ synchronized flow of the base and catalyst components is further assured by a common mechanical linkage between the two inlet valves and the two outlet valves; one cannot open or close without the other. The valves are actuated 90° to fully open or fully close. Wide 1/2” valves and passages readily exhaust particles likely to interfere with check valves.
Coco™ valve bodies are stainless steel investment castings, and the balls are hardened steel ujder an electroless nickel plating. The valves are rated at 3,500 psi.
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