Bürkert Fluid Control Systems
Valves with ‘Kick and Drop’ electronics meet EMC requirements
When it comes to automating the switching process for fluids, valves fitted with electromagnetic actuators are widely used. To enable the coils in the solenoid to generate high starting power while also minimizing their power consumption, the coil is usually actuated electronically. This is normally achieved using pulse-width modulation, although this technology creates a source of EMC interference. It also emits noises that are considered disturbing due to their frequencies. This company therefore includes solutions with double coils and “Kick and Drop” (KD) electronics in its solenoid valve range. These devices stand out not only due to their silent operation, but also because they meet the strictest requirements as regards electromagnetic compatibility. In the KD electronics, the coil is initially overexcited by a high voltage pulse to generate the high starting power required to open the valve. After a few milliseconds, the electronics switch to an energy-saving holding power, thus drastically reducing power consumption. The technology is particularly suitable for valves that are kept continuously open, such as gas or tap water safety valves, as well as for battery-backed drainage systems. Thanks to the low power consumption, the max. self-heating (approximately 52°C at the guide assembly) of the valve is lower, which minimizes the build-up of deposits and calcification and substantially extends the valve’s service life. Unlike the control units with pulse-width modulation (PWM) that are normally used, KD electronics do not emit noises that are disturbing to humans and animals and are particularly suitable for use in home and building systems. Another advantage of KD technology is its electromagnetic compatibility. The KD double coil conforms to industrial and domestic EMC standards (DIN EN61000-6-1/2/3/4). Unlike the PWM controller, this technology does not generate interference frequencies. The need for complex and costly interference suppression measures is thus eliminated. Valves equipped with “Kick and Drop” electronics are available in nominal diameters of 2 to 50 mm. Hall 5, Stand D40 — Bürkert Fluid Control Systems, Ingelfingen, Germany