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　　Function and action characteristics of iron valve:Thermal radiation of the sun, steam or electric heat over heating can make the use of the safe shower very high, and the user can be scalded. Prevent iron valve installed in the safety showers, eye bath and other may be excessive heating water system, by sensing the water temperature in pipeline, the hot valve will automatically open, put off the hot water, when the temperature down to set temperature gradually closed again. The process will be recycled according to the need and the minimum amount of water to be discharged at the same time.