Butterfly spring valves are important safety attachments of boiler pressure vessels, they are used to prevent system pressure from exceeding allowable limit value.
蝶形弹簧安全阀是锅炉压力容器的重要安全附件，用于防止系统压力超过允许的极限值。
This value is used to compare the strength of materials, but a safety factor is applied when making design calculations, to bring the working stress well below the limit of proportionality.
此值被用来比较材料的强度，但是当设计计算时，要用一个安全系数，使工作应力低于比例限制。
The results show by the analysis and comparison, that the Swedish method and un equilibrium thrust method give low limit value with the least stability safety factor.
通过分析比较，说明瑞典法、不平衡推力法都是极小值解，稳定安全系数最小；
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