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2. Fail-safe - Wikipedia

   en.wikipedia.org/wiki/Fail-safe

   In HVAC control systems, actuators that control dampers and valves may be fail-safe, for example, to prevent coils from freezing or rooms from overheating. Older pneumatic actuators were inherently fail-safe because if the air pressure against the internal diaphragm failed, the built-in spring would push the actuator to its home position – of ...

3. Damper (flow) - Wikipedia

   en.wikipedia.org/wiki/Damper_(flow)

   Removal of electrical power re-opens the damper. This style of damper is advantageous because it is "fail safe"; if the control to the damper fails, the damper opens and allows air to flow. However, in most applications "fail safe" indicates the damper will close upon loss of power thus preventing the spread of smoke and fire to other areas.

4. Valve actuator - Wikipedia

   en.wikipedia.org/wiki/Valve_actuator

   The blue valve body is visible in-line with the pipe. The valve actuator opens or closes the butterfly disc of the valve based on electrical signals sent to the actuator. Another valve actuator is visible in the background, with windows to indicate the valve position. A valve actuator is the mechanism for opening and closing a valve. Manually ...

5. Shutdown valve - Wikipedia

   en.wikipedia.org/wiki/Shutdown_valve

   These actuators are normally fail safe fluid power type. Typical examples of these are: Pneumatic cylinder; Hydraulic cylinder; Electro-hydraulic actuator; In addition to the fluid type, actuators also vary in the manner in which the energy is stored to operate the valve on demand as follows:

6. Fire damper - Wikipedia

   en.wikipedia.org/wiki/Fire_damper

   Fail-safe rotary actuator for fire dampers. Fire damper in oversized hole in a 2-hour rated concrete slab. Mechanical dampers obstruct the cross-sectional area of a HVAC duct in the event of a fire either by means of a pivoting a fire-resistant board in Europe, or steel shutters in North America.

7. HVAC control system - Wikipedia

   en.wikipedia.org/wiki/HVAC_control_system

   However, when designing HVAC systems, many engineers design it for a specific setting and/or purpose. When engineers are designing an HVAC system, they try their best to make it compact while still being able to perform at the highest level and experiment with different ways to make HVAC systems as efficient as possible.