Thermostatic Expansion Valve

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A control mechanism for cooling in air conditioning systems.

  • A bulb of gas senses temperature. If temperature gets too hot, pressure inside bulb increases, and a diaphragm pushes the refrigerant orifice more open. This allows more refrigerant to pass through, cooling the system. This happens automatically. See video at this time, going from normal to a hot spike that is stabilized: [1]