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One of the more common kinds of pump for hydraulic fuel power applications is the gear pump. The gear pump operates by using the meshing gears to pump fluid by displacement. These machines are also commonly used to pump fluids with precise velocities in chemical installations. Two main types of gear pumps exist. Internal gear pumps make use of an external and an internal spur gear and external gear pumps use two external spur gears. Gear pumps pump a continuous amount of fluid for every revolution. This defines them as positive or fixed displacement. A few gear pump devices are designed to operate as either a pump or a motor.
When the gears on the pump turn, they divide on the intake side of the pump. This creates a void and suction that is filled by fluid. This fluid is passed by the gears to the discharge side of the pump, and this is where the meshing of the gears functions to be able to displace the fluid. There are tight and really small mechanical clearances, which together with the speed of revolution efficiently prevent the fluid from leaking backwards. The rigid fabrication of the gears and houses provides the pump its ability to pump highly viscous fluids and allow for excessively high pressures.
Lift trucks may be purposely marked for use in unsafe places. A marked forklift denotes the design has met the least standards of ANSI/UL 558 intended for engine powered forklifts or ANSI/UL 583 for electric trucks for the type of label put.
Applications for labeled trucks could be found in National Fire Protection Association NFPA 505 - Powered Industrial lift trucks including: Maintenance and Operation, Type Designations, and Areas of Use. Ask your local insurance provider and Fire Marshall for more information concerning the approved uses of industrial powered lift trucks in your application.
If the forklift has been found to meet the outlined criteria, the following labels could be put. A marked truck would have the model designation placed on the forklift nameplate and will have one of the following labels placed.
