安全阀的压力值在出厂时已经调定，使用中不要随意调节。
The pressure of safety value has been settled up well in factory, don t adjust it freely.
所必需的回压通常由一个阀来产生和控制，此阀被调定在所要求的条件范围内进行工作。
The necessary back-pressure is often created and controlled by a valve that is set to operate under the desired range of conditions.
针对山西兴能发电有限责任公司高压主汽阀门泄漏以及高压调汽阀卡涩的问题，从垫片的材质、螺栓的预紧力以及机械结构等多方面进行了细致地分析。
Focus on the leak and block of the high pressure main stop valve, from the material of the gasket, the pressure of the bolt and the entire mechanical structure in Gujiao Xingneng Power Generation Co.
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