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根据读者要求,本刊自1981年第1期起,特辟“为您解答”专栏,以普及工业仪表与自动化装置方面的基础知识和解答有关问题。热烈欢迎广大读者来信来稿。云南安宁苏书田同志来信问:①气体管路截止阀的阀口有图1、2两种型式,如何选用才合适?②图1阀口的一圈凸起有何作用?为什么不能去掉变成图3的型式?③图2阀杆和阀体材料的硬度差为多少较为合适?④有关上述两种阀门的计算公式及有关阀门的著作有哪些?
According to the reader’s request, since the first issue in 1981, we published a special column entitled “Answers to You” to popularize the basic knowledge of industrial instruments and automation devices and answer relevant questions. A warm welcome to readers for your contributions. Comrade Su Ningtian, Anning, Yunnan, asked: (1) There are two types of valve ports in the gas pipeline shut-off valve. How to select them? (2) What is the function of a circle of valve port in Fig. 1? 3 type? ③ Figure 2 stem and valve body material hardness difference is more appropriate? ④ The above two types of valve calculation formula and the valve works which?