The new Quiet Operation High Density Interface (HDI)
is a three-way solenoid valve designed to increase patient
comfort by reducing actuation noise by 50%. A
typical solenoid valve has an inherent clicking sound
when energized, which is caused by the metal-to-metal
contact of the moving armature and stationary core. The
new Quiet Operation HDI uses “whisper” technology to
provide a 10 Hz valve-cycle frequency and a sound level
measurement of less than 37 dBA when measured at a
distance of 24 in. Available in face mount, plug-in, and
ported configurations, the Quiet Operation HDI is suitable
for medical devices using flowing gas or air such as
dialysis machines, patient monitors, and ventilators/
respirators.

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