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蒸汽机车上使用的华氏阀装置,虽然它在热力学方面未能满意,但由于它在结构学及材料力学方面的实用上具有很多优点,故仍被一直使用到现在。此次设计的自动可变导程阀装置,是针对华氏阀装置的缺点(即不论断汽的大小其导程始终保持不变),并参考了内燃机的自动进角装置的结构,不使本装置的机构特别复杂而能适应不同的断汽来自动地改变导程以提高热效率和减少煤、水的消耗量。一切动力机构必须将起动条件及连续运转
The Fahrenheit valve assembly used in steam locomotives, although not thermodynamically satisfactory, has been used until now due to its practical advantages in structural and material mechanics. The design of the automatic variable lead-valve device, Fahrenheit valve device for the shortcomings (that is, regardless of the size of the steam off its lead has remained unchanged), and reference to the internal combustion engine automatic angle device structure, The device’s mechanism is particularly complex and adaptable to different off-steam to automatically change the lead to improve thermal efficiency and reduce coal, water consumption. All power agencies must start the conditions and continuous operation