Air Pressure Control Valves and Air Pressure Stabilisers

Protecting individual doors

The protection mechanism for individual doors is examined below based upon the assumption that only one door is open at any time. Within the overall supply volumes available it is not possible to provide protection for more than one open door at a time.

Theatre - Anaesthetic door open

Double door - Required flow 0.57 m3/s. (Sterile) - (Transitional)

When this door opens the pressure in the combined Theatre/ Anaesthetic becomes 17 Pa, which causes the stabilisers between Theatre and Exit Bay and Scrub and Corridor to close down diverting air across this doorway. The door leakage across the Anaesthetic to Theatre door increases to 0.1 m3/s and the stabiliser between Anaesthetic and Corridor has to be sized to handle 0.47 m3/s (@ 14 Pa differential) to provide an outflow path.