Small, light, inexpensive
The trend in diagnostic and therapeutic medicine is towards ever-smaller and lighter devices. In mobile applications, for example oxygen therapy, the emphasis is on minimal power consumption, low weight and high reliability. Ideal for these requirements: the proportional valve VEMP with piezo technology.
Mode of operation of the piezo valve VEMP
Pressure regulation: 3/3-way valve
The piezo valve has two benders and three ports. A complete pressure regulation system can be set up with this compact solution. There’s one bender for pressurization and a second one for exhausting. The third state is closed, thus maintaining the pressure. In concrete terms, it looks like this:
No heat build-up
The extremely compact proportional valve VEMP requires very little power at 1 mW: it maintains its current operating status even when de-energized, while very little power is required to change the flow rate. This means that there is no heat generation. Weighing in at only 20 g, it is therefore ideally suited for use in mobile devices such as portable oxygen therapy units.
Proportional behavior
The VEMP enables extremely precise proportional control of gas flow rates from 0 to 30 l/min, as well as pressure. With a switching speed of 15 ms, it can react very quickly to setpoint changes. It is ideal for oxygen/ventilation therapy, medical mattresses, ophthalmology and dialysis. The flow setpoint can be set using a DC voltage, which means that no pulse-width modulated signal is required for control.
Silent
The piezo technology uses a completely different mechanical system to solenoid valves, and is quiet in operation.
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