活塞式制冷压缩机吸排气过程的平均相对压力损失是评价气阀经济性能和计算压缩机热力、动力性能的重要参数。本文在理论分析的基础上,求得了适于计算各类活塞式制冷压缩机吸排气平均相对压力损失的通用公式。 Piston refrigeration compressor suction and exhaust process of the average relative pressure loss is to evaluate the economic performance of the valve and calculate the compressor thermal and dynamic performance of the important parameters. Based on the theoretical analysis, this article obtained a general formula suitable for calculating the average relative pressure loss of various types of piston refrigeration compressors.