The Lee Company’s new Quiet-Operation High-Density Interface (HDI) is a three-way solenoid valve designed to achieve patient comfort by reducing actuation noise by 50 percent. 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. This new quiet-operation design uses “whisper” technology to provide a sound level measurement of less than 37 dBA when measured at a distance of 24 inches and a valve cycle frequency of 10 Hz. Available in face mount, plug-in and ported configurations, the Quiet-Operation HDI is a good fit for medical applications flowing gas or air, such as dialysis machines, patient monitors, ventilators/respirators, and other bedside medical devices.