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External gear pump is a popular pumping principle, and is often used as a lubrication pump in the machine tool, the fluid power transmission unit, and as a fuel pump engine. External gear pump can be single or double (2 sets of gear) pump configuration straight (display), spiral, and herringbone gear. Spiral gears and herringbone usually provide a smoother flow than spur gears, though all gear types are relatively smooth. Large-capacity external gear pumps usually use helical or herringbone gears. Small external gear pumps typically operate at 1750 or 3450 rpm and larger models operate at up to 640 rpm. External gear pumps have close tolerances and gear on both sides of the shaft bracket. This allows them to run at pressures over 3000 lbs / 200 bars, making them ideal for use in hydraulics. Four bearings in liquid and tight tolerances, they are not suitable for abrasive or extreme high temperature applications. Strict internal clearance provides a more reliable measurement of liquid through the pump and greater flow control. As a result, external gear pumps are the most popular polymers, fuels, chemical additives for precision conveying and metering applications. How External Gear Pumps Work: External Gear Pumps A similar internal pump gear for suction as well as gears in and out of the network. However, the external gear pump rotates with the same gear to each other - one driven by a motor to drive the other gear. Support for each gear, shaft and bearing on both sides of the gear. 1. As the gears mesh, they create and expand the intake side of the positive displacement pump. Liquid flows into the cavity and is trapped by the teeth for their rotation. 2, liquid in the shell inside the pocket between the teeth and the shell - it does not pass the middle gear. 3. Finally, the meshing gear forces the liquid through the outlet port under pressure. Due to the gear support on both sides, external gear pumps are often used for high pressure applications such as hydraulic applications. Without hanging bearing loads, the rotor shaft can not be shifted, leading to premature wear. External Gear Pump Advantages: High Speed ​​High Pressure No Suspension Bearing Load Relatively Quiet Operation Design Accommodates Various Materials
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