Limited by the ring material, the use of butterfly valve pressure and low temperature range.
受密封圈材料的限制，蝶阀的使用压力和工作温度范围较小。
Temperature variation is an important factor affecting ring rolling process.
温度变化是影响环件轧制过程的重要因素。
Low acid value resins were synthesized by E10 with low temperature ring opening.
采用E10低温开环酯化合成低酸值树脂。
Low acid value resins were synthesized by E10 with low temperature ring opening.
采用E10低温开环酯化合成低酸值树脂。
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