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汽车上的节温器是用来缩短发动机起动后的暖机时间的。也就是说，节温器能按水温的高低自动地调节冷却水的循环流量和其循环范围（即冷却水通过散热器冷却的大循环和不通过散热器的小循环），从而使发动机的水温保持在最有利于发动机工作范围内。它是用冷却水温度控制的自动阀
The thermostat on the car is used to shorten the warm-up time after starting the engine. In other words, the thermostat according to the level of water temperature automatically adjusts the cooling water circulation flow and its circulation range (ie cooling water through the radiator cooling cycle and not through the radiator circulation), so that the engine water temperature Maintain in the most favorable range of engine work. It is automatic valve with cooling water temperature control