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One of the more common types of pump used for hydraulic fuel power applications is the gear pump. The gear pump works by utilizing the meshing gears to pump fluid by displacement. These devices are even commonly used to pump fluids with precise velocities in chemical installations. Two main types of gear pumps are available. Internal gear pumps utilize an an internal and an external spur gear and external gear pumps utilize two external spur gears. Gear pumps pump a constant amount of fluid for each and every revolution. This defines them as fixed or positive displacement. Some gear pump devices are designed to function as either a pump or a motor.
While the gears on the pump rotate, they divide on the intake side of the pump. This creates a void and suction which 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 operates to be able to displace the fluid. There are tight and really small mechanized clearances, which together with the speed of revolution efficiently avoid the fluid from leaking backwards. The rigid fabrication of the houses and gears gives the pump its ability to pump highly viscous fluids and allow for excessively high pressures.
Forklifts may be specifically labeled to be used in dangerous locations. A labeled lift truck indicates the design has met the least standards of ANSI/UL 558 meant for engine powered forklifts or ANSI/UL 583 used for electric forklifts for the type of label attached.
The application for labels intended for lift forklifts may be found in National Fire Protection Association NFPA 505 - Powered Industrial lift trucks including: Areas or Use, Maintenance and Operation, and Type Designations. Consult your local insurance carrier and Fire Marshall for more info on the approved uses of industrial powered forklifts in your application.
If the forklift has been found to satisfy the outlined criteria, the following labels can be placed. A marked truck will have the type designation put on the lift truck nameplate and would have one of the following labels put.
