In light of the occupational hazards involved with treating patients confined to isolation rooms, or bio hazardous laboratories, it is best practice that a hospital or research lab room pressure sensor be inspected, re-certified, maintained, and recalibrated if necessary, at least once per year.
You do not need to lubricate, replace parts, or periodically service the Venturi Air Valve in any way. Proper installations and field startup ensure that the valves provide years of ongoing operation.
Ensure compliance with any owner or regulatory requirements that may mandate specified periods of inspection, maintenance, and re-calibration.