Valve controller regulates fluid dispensing cycle
Nordson EFD has unveiled a valve controller that boasts dispensing precise and repeatable amounts of adhesives, lubricants, and other assembly fluids used in medical devices, automotive components, or portable electronics.
The ValveMate 9000 features independent dual-valve control programming, each with 24W temperature controllers for J-type thermocouples. Each channel can drive a remote high-speed solenoid valve up to 500Hz. According to the company, such dispensing speeds produce a voltage that can potentially damage the dispense system, but a unique spike-and-hold functionality keeps the valve in check. When properly set, the spike-and-hold function allows the controller to spike the voltage for a user-specified spike time and then throttle the voltage down to a user-specified hold voltage after the spike time expires.
The valve controller also includes two electronic pressure regulators to provide stability in the fluid reservoir by maintaining consistent dispensing with full-to-empty pressure control. This allows the system to compensate for periodically changing conditions, such as fluid viscosity changes, and can be used to alter the dispensing patterns and create deposits of different sizes.
An auto-increment mode adjusts the dispensing parameters after a certain number of shots or a specific elapsed time. At the same time, a remote program system allows parameter setting of the dispense station from the host PC or programmable logic controller.
"The benefits of controlled fluid dispensing include higher yields, greater process control, better quality, less rework, fewer rejects, and lower production costs," said Claude Bergeron, EFD global product line manager.