Clean processes Perfect dry system, clean vacuum and no oil mist are available as lubricating oil or sealing water are not employed inside the pump and any bearing is not equipped around the part touching gases. Structure In addition to perfect dry system, Air-Flush enables to improve outlet of water vapor and foreign substances, durability and maintenance interval. 250 Pa ultimate Pressure Operating efficiency has been dramatically improved as loss of vacuum does not occur even for prolonged operation. Low noise GVS series can be installed at work hand as orbiting scroll enables soft noise. Low running cost Daily management cost is to be cut down as only annual maintenance is required for general use.