1.ZYB-90 Gear Pump is designed and manufactured with American advanced technologies, and material of the main body is alloy aluminum founded low pressure. Air separator, bypass valve, check valve and filter are built inside it. It is designed for gasoline, diesel, kerosene or compound of them. It has the features of pretty designment, high vacuum, long suction head, stable performance, low noise and long service life and so on. 2.Working Principle: After starting motor,high-pressure vacuum zone is produced in the pump, petroleum in hose is sucked in into pump by the high pressure vacuum, then petroleum passes air separator and filter, in which gas and other airs are separated from petroleum, then the pure petroleum is put into flow meter with the constantly running gear. 3.Technical Specification: Max Flow Rate: 90 L/min Vaccum: ≥0.06 Mpa Working Pressure: 0.18～0.3 Mpa Working Temprature: -50°C～60°C Noise: ≤72Db Main Body: Alloy Aluminum