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The "PressureInternal" value is a measure of the pressure inside the active vent pipe network.
 
The "PressureInternal" value is a measure of the pressure inside the active vent pipe network.
  
Contrary to popular belief, both values are enforced, so the Active Vent comes with the functionality of a Pressure Regulator and simultaneously also Back Pressure Regulator. Note that setting these value and changing the Mode afterwards is ill-advised: Changing the Mode always resets both values to their defaults (101/0 for pumping into the room, 0/50 for pumping into the pipe), so they must be set (if at all) *after* setting the Mode.
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Its functionality depends on the selected mode but when used manually both modes only use the "PressureExternal":
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* In "Outward mode" (switch in blue), the active vent increases the external pressure by moving gas from the pipe network to the surrounding atmosphere, up to "PressureExternal", by default equal to 101 kPa
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* In "Inward mode" (switch in red), the active vent decreases the external pressure by moving gas from the surrounding atmosphere to the pipe network, down to "PressureExternal", by default equal to 0 kPa
  
* In "Outward mode" (switch is blue), the Active Vent increases the external pressure by moving gas from the pipe network to the surrounding atmosphere, up to "PressureExternal", but never allowing the pipe's pressure to drop below "PressureInternal".
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The "PressureExternal" value is set to 100 kPa when the [[Circuitboard (Airlock Control)|Circuitboard (Airlock Control)]] is used in a [[console|Console]]. This is the reason why the airlock is unable to pressurise when the atmosphere surrounding the active vent is unable to reach 100 kPa within the airlock.
* In "Inward mode" (switch is red), the Active Vent decreases the external pressure by moving gas from the surrounding atmosphere to the pipe network, down to "PressureExternal", never exceeding the pipe pressure set in "PressureInternal".
 
 
 
The "PressureExternal" value is set to 100 kPa when the [[Circuitboard (Airlock Control)|Circuitboard (Airlock Control)]] is used in a [[console|Console]]. This is the reason why the airlock is unable to pressurize when the atmosphere surrounding the active vent is unable to reach 100 kPa within the airlock.
 
  
 
The "PressureExternal" values can also be inconvenient on worlds like Loulan whose atmosphere is well above 101kPa. Manually-operated airlocks can not equalise the pressure within the airlock during the exit cycle to the Loulan atmosphere pressures. Without equal pressures you can not prevent wind currents from occurring when opening airlock doors. The active vent has no effect when the external pressure within the airlock surrounding the active vent is already >101kPa. When the pressure is <101kPa the vent will stop when it reaches 101kPa.
 
The "PressureExternal" values can also be inconvenient on worlds like Loulan whose atmosphere is well above 101kPa. Manually-operated airlocks can not equalise the pressure within the airlock during the exit cycle to the Loulan atmosphere pressures. Without equal pressures you can not prevent wind currents from occurring when opening airlock doors. The active vent has no effect when the external pressure within the airlock surrounding the active vent is already >101kPa. When the pressure is <101kPa the vent will stop when it reaches 101kPa.

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