HM Series Characteristic HM series one-stage V-belt air compressor adopts a durable structure design, with graceful crankcase. Its key parts are machined in CNC machining center, single-system valve design provides high compression efficiency and easy maintenance. The fine cast iron materials ensure super abrasion performance. Its multi-blade cooling fan is the best cooling system. Suitable for factories, automatical control system, vehicle maintenance, painting, etc with the need of compressed air.