Introduces the working principle and the method of the selection about the type ZY47 Valve controlled by the pressure difference, and analyses its adaption condition.
介绍了ZY 47型自力式压差控制阀的工作原理和选型方法，分析了不同被控环路系统的适用条件。
It describes basic condition of instrument and meter normal working, analyse all kinds of disturbing factors, raise its design and selection and environment requirement.
论述了仪器仪表正常工作的基本条件，分析影响(干扰)其正常工作的各种因素，提出仪表设计造型及对环境的要求。
According to the working condition, the improvement measures had been adopted in material selection and construction design, the service life of the cooling pipe has been prolonged.
基于材料使用环境考虑，在选材和结构设计两个方面采取了改进措施，延长了冷却水管的使用寿命。
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