Final answer:The poppet of a pressure regulator is opened by the adjustment spring. The regulator functions to keep a specific pressure at the downstream side, with the poppet opening and closing due to forces exerted by the upstream pressure and adjustment spring, similar to airmovingbetween two different-sized balloons due to a difference in internalpressure.Explanation:The poppet of a pressure regulator, a key component in a pressureregulationsystem, is opened by the Adjustment Spring. In general, the purpose of a pressure regulator is to control or maintain a reduced or specific pressure in the downstream side of the valve. This is achieved through the function of both the poppet and the adjustment spring.In a simpler term, the poppet, a small valve, opens or closes due to the force exerted by the adjustment spring. When the upstream pressure (the pressure before the regulator) increases, it tries to push the poppet open, allowing the pressurized fluid to pass through the regulator. On the other hand, the adjustment spring works to keep the poppet closed by exerting a force against theupstreampressure.This principle can be viewed similar to the example of the two different-sized balloons, in which air moves from one balloon to the other due to the difference in pressure. In the same way, the pressure in the regulator moves from a region of high pressure (upstream) to a region of low pressure (downstream) when the poppet is opened by the adjustment spring.Learn more aboutPressure Regulatorhere:brainly.com/question/33728571#SPJ11...

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