In any fluid handling system, valves are the controlling element: starting or stopping flow, regulating or throttling flow, preventing backflow, or relieving and regulating pressure.

在任何流体处理系统中，阀门是作为控制装置：启动或停止流体流动，对流体进行调节或节流，防止倒流，或释放和调节压力。

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The utility model provides a pressure-regulating pressure-limited valve for a pressure cooker.

本实用新型提供了一种压力锅用调压式限压阀。

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A pressure controller is employed to modulate speed of regulating pressure fan in a PID control mode.

利用一个压力控制器，采用PID控制方法对调压风机进行变频控制。

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These valves use a screw type valve instead of a simple flap, and they have a pressure regulating mechanism that will vent water to the ground if the intake pressure exceeds a set level.

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