Permanent magnet variable frequency screw air compressor micro oil energy-saving silent 7.5 15 22 37KW direct connected fixed air pumpDouble stage permanent magnet variable frequency screw air compressor, two-stage, 37 55 75 110 132 250KW, energy-saving and power-saving 

Screw air compressor power frequency fixed direct connection tunnel coal mine engineering drilling rig air draft special 132KW175P