... Machinery Research Institute. 1. Semi-hermetic piston compressorCopeland semi-hermetic piston compressor;Copeland has rich experience in ... BF10Z, NJ-BF20Z, NJ-BF25Z:Copeland semi-hermetic piston compressor, oil separators, air-cooled condenser, axial flow ... , pressure controls, motor overheat protector, cylinder end cooling fan, junction box(IP55).Technical parameters modelcompressorAir-cooled ...