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1. any of various mechanisms or devices, such as a governor valve, for controlling fluid flow, pressure, temperature, voltage, etc.
2. a gene the product of which controls the synthesis of a product from another gene
A device that maintains a desired quantity at a predetermined value or varies it according to a predetermined plan.
An opening in a wall or door in the return airway of a district to increase its resistance and reduce the volume of air flowing.
In a gas supply system, a device for controlling and maintaining a uniform gas supply pressure.