Apressure O2 Regulator是控制阀门这将流体的输入压力降低到其输出处的所需值。调节器用于气体和液体，可以是一个具有输出压力设置的积分装置，一个限制器和一个一个主体中的传感器，或由单独的压力传感器，控制器和流动阀组成。
A pressure regulator’s primary function is to match the flow of gas through the regulator to the demand for gas placed upon it, whilst maintaining a constant output pressure.
如果负载流量减小，则调节器流量也必须减小。如果负载流量增加，则必须增加调节器流量，以防止由于压力系统中气体短缺而导致控制压力的减小。
压力调节器包括restricting element， 一个loading element， 一个nd a测量元素:
- The restricting element is a valve that can provide a variable restriction to the flow, such as a地球阀,butterfly valve,poppet valve， ETC。
- 加载元件是可以将所需力应用于限制元素的部分。可以通过重量，弹簧，活塞执行器或diaphragm执行器与弹簧结合使用。
- The measuring element functions to determine when the inlet flow is equal to the outlet flow. The diaphragm itself is often used as a measuring element; it can serve as a combined element.
In the pictured single-stage regulator, a force balance is used on the diaphragm to control a poppet valve in order to regulate pressure. With no inlet pressure, the spring above the diaphragm pushes it down on the poppet valve, holding it open. Once inlet pressure is introduced, the open poppet allows flow to the diaphragm and pressure in the upper chamber increases, until the diaphragm is pushed upward against the spring, causing the poppet to reduce flow, finally stopping further increase of pressure. By adjusting the top screw, the downward pressure on the diaphragm can be increased, requiring more pressure in the upper chamber to maintain equilibrium. In this way, the outlet pressure of the regulator is controlled.
High pressure gas from the supply enters into the regulator through the inlet valve. The gas then enters the body of the regulator, which is controlled by the needle valve. The pressure rises, which pushes the diaphragm, closing the inlet valve to which it is attached, and preventing any more gas from entering the regulator.
The outlet side is fitted with a pressure gauge. As gas is drawn from the outlet side, the pressure inside the regulator body falls. The diaphragm is pushed back by the spring and the valve opens, letting more gas in from the supply until equilibrium is reached between the outlet pressure and the spring. The outlet pressure therefore depends on the spring force, which can be adjusted by means of an adjustment handle or knob.
出口压力和入口压力将隔膜/poppet组件固定在闭合位置，反对大弹簧的力。如果供应压力下降，好像大弹簧压缩增加了，从而使更多的气体和更高的压力在出口室内建造，直到达到平衡压力。因此，如果供应压力下降，则出口压力将增加，如果出口压力保持在供应压力下降以下。
这是坦克终端垃圾场的原因，在该垃圾场中，加压箱提供了供应。在单级调节器的情况下，当供应罐降低时，较低的入口压力会导致出口压力爬升。如果未调整弹簧压缩以进行补偿，则Poppet可以保持打开状态，并允许油箱快速倾倒其剩余内容物。换句话说，供应压力越低，在给定的弹簧设置中，调节器可以达到的压力差就越低。
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