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A gear pump is amongst the most common types of pumps utilized for applications of hydraulic fluid power. A gear pump operates by utilizing the meshing of gears to be able to pump fluid by displacement. These machines are generally utilized in chemical installations in order to pump fluid with specific viscosity. Two main types of gear pumps exist. Internal gear pumps make use of an external and an internal spur gear and external gear pumps utilize two external spur gears. Gear pumps pump a continuous amount of fluid for every revolution. This defines them as positive or fixed displacement. Some gear pump devices are designed to work as either a pump or a motor.
As the gears on the pump turn, they divide on the pump's intake side. This creates a void and suction that is filled by fluid. This fluid is carried by the gears to the discharge side of the pump, and this is where the meshing of the gears functions so as to displace the fluid. There are really small and tight mechanical clearances, that along with the speed of revolution effectively avoid the fluid from leaking backwards. The rigid construction of the gears and houses gives the pump its ability to be able to pump highly viscous liquids and allow for excessively high pressures.
Forklifts could be particularly marked to be used in hazardous locations. A labeled truck indicates the design has met the least requirements of ANSI/UL 558 intended for engine powered forklifts or ANSI/UL 583 utilized for electric trucks for the type of label placed.
Applications for labeled forklifts can be found in National Fire Protection Association NFPA 505 - Powered Industrial trucks including: Areas or Use, Maintenance and Operation, and Type Designations. Check with your local insurance carrier and Fire Marshall for more info about the permitted uses of industrial powered trucks in your application.
If the forklift has been proven to meet the outlined standards, the following labels may be attached. A marked truck would have the model designation placed on the lift truck nameplate and will have one of the following labels attached.