The special structure is analyzed for the vertical twin screw compressor.
研究了立式螺杆制冷压缩机的结构特点。
Vertical three-screw pump smooth operation, low noise.
立式三螺杆泵运行平稳，噪音低。
Straight-through, right angle cast steel screw down vertical storm valve.
直通、直角铸钢可闭立式防浪阀；
Straight-through, right angle cast steel screw down vertical storm valve.
直通、直角铸钢可闭立式防浪阀；
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