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  2. District heating substation - Wikipedia

    en.wikipedia.org/wiki/District_heating_substation

    Differential pressure controller - to balance the network and improve working conditions of control valve; Temperature controller - to control temperature on secondary side by regulating the flow on primary side; Temperature sensor - to sense flow and return temperatures required for temperature control

  3. HVAC control system - Wikipedia

    en.wikipedia.org/wiki/HVAC_control_system

    HVAC (Heating, Ventilation and Air Conditioning) equipment needs a control system to regulate the operation of a heating and/or air conditioning system. [1] Usually a sensing device is used to compare the actual state (e.g. temperature) with a target state. Then the control system draws a conclusion what action has to be taken (e.g. start the ...

  4. Pressure measurement - Wikipedia

    en.wikipedia.org/wiki/Pressure_measurement

    Differential pressure is the difference in pressure between two points. Differential pressure sensors are used to measure many properties, such as pressure drops across oil filters or air filters, fluid levels (by comparing the pressure above and below the liquid) or flow rates (by measuring the change in pressure across a restriction ...

  5. Automatic balancing valve - Wikipedia

    en.wikipedia.org/wiki/Automatic_balancing_valve

    Electronic Pressure-independent control valves use a flow meter or a pressure drop across an orifice to provide flow data to an actuator that works to provide the correct flow down stream. These valves offer much lower pressure requirements as a pressure regulator requires a pressure within a range to achieve operation.

  6. Setra Systems - Wikipedia

    en.wikipedia.org/wiki/Setra_Systems

    Founded in 1967, Setra Systems, Inc. is a USA-based designer and manufacturer of pressure, humidity and current sensing products for the HVAC industry. In 2001, Setra was acquired by Danaher Corporation. Setra Technology Park is located in Boxborough, MA.[2]

  7. Control valve - Wikipedia

    en.wikipedia.org/wiki/Control_valve

    The pneumatic control signals are traditionally based on a pressure range of 3–15 psi (0.2–1.0 bar), or more commonly now, an electrical signal of 4-20mA for industry, or 0–10 V for HVAC systems. Electrical control now often includes a "Smart" communication signal superimposed on the 4–20 mA control current, such that the health and ...

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