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A gear pump is among the most common kinds of pumps for applications of hydraulic fluid power. A gear pump functions by utilizing the meshing of gears to be able to pump fluid by displacement. These devices are generally used in chemical installations in order to pump fluid with specific viscosity. Two main types of gear pumps are available. Internal gear pumps use an an internal and an external spur gear and external gear pumps make use of two external spur gears. Gear pumps pump a continuous amount of fluid for each and every revolution. This defines them as fixed or positive displacement. Several gear pump machines are designed to function as either a pump or a motor.
When the gears on the pump revolve, they separate on the pump's intake side. This creates a suction and void that is filled by fluid. This fluid is passed by the gears to the discharge side of the pump, and this is whereby the meshing of the gears works to displace the fluid. There are tight and very small mechanical clearances, which along with the speed of revolution effectively avoid the fluid from leaking backwards. The rigid construction of the houses and gears gives the pump its ability to pump highly viscous fluids and allow for excessively high pressures.
Lift trucks could be particularly labeled for use in unsafe places. A labeled forklift indicates the design has met the minimum requirements of ANSI/UL 558 intended for engine powered forklifts or ANSI/UL 583 meant for electric lift trucks for the type of label attached.
The use for labels intended for lift lift trucks can be found in National Fire Protection Association NFPA 505 - Powered Industrial forklifts including: Maintenance and Operation, Type Designations, and Areas of Use. Ask your local insurance carrier and Fire Marshall for further info about the permitted uses of industrial powered trucks in your application.
If the forklift has been found to meet the outlined standards, the following labels may be put. A marked truck would have the type description located on the lift truck nameplate and will have one of the following labels attached.
