Energy-saving and compact analysis valves

In medical and analytical technology as well as in pharmaceuticals or pipetting applications, media separation in valves via a chemically resistant elastomer diaphragm that complies with regulations is important in order to prevent contamination of the fluid even during longer periods of use. When larger flow rates or flushing quantities also have to be metered quickly and precisely, the valves are often the weakest link in the chain. Until now, users have had to make compromises here, especially in terms of size, but also in terms of flow rate, permissible temperature or process times.

WhisperValve family expanded

Bürkert Fluid Controls Systems has expanded its WhisperValve series for the above reasons: The new Type 6757 analysis valve now covers the pressure range up to 16 bar and is insensitive to pressure surges, according to the manufacturer. In addition, its design enables switching times of less than 8 ms with a power consumption of less than 4.5 W, making it ideal for battery-powered field devices. The wetted components are selected according to the fluids involved. Therefore, the valve is also suitable for critical reagents or cleaning agents and withstands 90 °C media temperature for up to 30 min, for example in sterilization processes. This also applies to the smaller members of the WhisperValve family Type 6712 and 6724, which are designed for system pressures up to 7 bar. This results in a wide range of applications, from mobile and stationary measuring and analysis devices in medical and laboratory technology, to systems for endoscope cleaning or filling systems, to disinfection devices.

Energy efficient and virtually no heat input

According to the manufacturing company, the pulse variants of the WhisperValve switch back and forth between the switching positions practically silently with only a short current pulse and then also hold them currentless by means of permanent magnets. In this way, both long-term measurements with continuous reagent flow can be implemented in a battery-saving manner and sensitive media can be switched through the valve without heat input. Since energy is only required briefly during the switching process, both the energy consumption and the heat input do not depend on the duty cycle, but only on the switching frequency. The back-pressure-tight, easy-to-flush valves permit fast switching operations with operating noise levels during changeover of just under 20 dB(A) for the medium-sized Type 6724, which is therefore also suitable for use in particularly noise-sensitive areas at the point of care. The operating noise of the small Type 6712 is 36 dB(A), while the maximum noise level of the large Type 6757 is 45 dB(A). The 2/2- or 3/2-way valves of the WhisperValve family are only 7 mm, 9 mm and 18 mm wide and can be easily connected in series or combined to form complete system solutions. The technical functionality within the product family is the same, thus facilitating electrical control and, if necessary, approvals. An electronic expansion module can be used to implement analysis functions, for example feedback on switching positions, unwanted pressures, temperatures or energy consumption. Optional expansion modules also enable boost pulse or soft close functions.

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