Valve Controls Gas Flows in Medical Devices

A quiet-operation, compact, high-density interface (HDI) three-way solenoid valve for controlling gas or air flows in medical devices has been introduced by Lee Products. The valve operates with noise levels reduced by 50 per cent compared with other types of solenoid valves, according to the company. A typical solenoid valve operates with an inherent clicking sound when energised, which is caused by the metal-to-metal contact of the moving armature and stationary core.

With Lee Products' quiet-operation HDI valve, a synthetic hydrocarbon fluid is used in the wetted section of the valve. This effectively dampens the sound level of the valve's components to less than 37dBA when recorded and measured at a distance of 24in and a valve cycle frequency of 10Hz. Other features of the valve include an operating pressure range of Vacuum - 45psig (0-15psid) and a flow capacity on air (three-way model) of 4.4 SLPM at 10psig (1,500Lohms; Cv = 0.013).

Operating temperature range is 40 to 120F and life expectancy is 250 million cycles. Available in face-mount, plug-in and ported configurations, the quiet-operation HDI weighs less than 4.5g and is suited for medical applications including dialysis machines, patient monitors, ventilators, respirators and other bedside medical devices.

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