以下为句子列表：
英文: Do not use an old or existing valve as it may be damaged or not adequate for the working pressure of the new water heater.
中文: 不要采用旧的或原有的阀门，否则可能会损坏或不符合新热水器的工作压力。
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英文: Generally, under the situation of steady tested pressure, the maximum working pressure shall not exceed 2/3 of the upper limit value of the instrument; while in measuring pulse pressures, the maximum working pressure shall not exceed 1/2 of the upper limi
中文: 一般在被测压力稳定的情况下，最大工作压力不应超过仪表上限值的2/3；测量脉动压力时，最大工作压力不应超过仪表上限的1/2；测量高压时，最大工作压力不应超过仪表上限的1/3。
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英文: In order to determine thermal loading and working pressure of nozzle inner contour, the gas was regarded as one dimensional isentropic flow, and temperature field of nozzle was computed based on three-dimension finite element model.
中文: 将燃气简化为一维等熵流以确定喷管内型面所承受的温度和压力载荷，基于三维有限元模型，计算了喷管的瞬时温度场。
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英文: Must not be rated higher than the working pressure shown on the data plate of the water heater.
中文: 额定压力不能高于热水器参数板上显示的工作压力。
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英文: The stress and working pressure on teeth of the staged nut in screw presses has been studied by FEM method which proves that using staged nut in screw presses is helpful for improving the non-uniform distribution of stress and working pressure on the teet
中文: 摘要采用了有限元法对滑动螺旋压力机的阶梯式螺母进行了受力分析，研究了螺母螺牙应力及螺牙工作面的接触压力，并将阶梯式螺母与普通螺母进行对比，认为螺旋压力机中使用阶梯式螺母有利于改善螺牙牙根应力轴向应力分布不均和螺牙工作面的接触压力分布不均的情况，从而提高螺旋工作寿命。
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