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nature : automatic adjustment of the law. By adjusting the parameters were transferred level (or size) in two locations (or value) and meet the requirements of the given value. For example, the production process requirements of the liquid storage tank at a given value near, when the surface below the given value, the control valve to the open water inlet. When the liquid level higher than the given value, the control valve opened to stop water flow (see Buoyancy Level dollars). Apart from regulating traffic flow, pneumatic instrumentation, and gas supply systems of the air tank pressure regulator, incubators, electric oven, possession of the furnace temperature regulation, etc., are double-conditioning. Double-regulator of the advantages of the relatively simple structure. Weakness is only two numerical output, only two control valve position limit inevitably have greater deviation.
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