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A gear pump is one of the most common types of pumps for applications of hydraulic fluid power. A gear pump operates by using the meshing of gears to be able to pump fluid by displacement. These machines are widely used in chemical installations in order to pump fluid with specific viscosity. Two main types of gear pumps are available. Internal gear pumps make use of 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 revolution. This defines them as fixed or positive displacement. Several gear pump devices are designed to operate as either a pump or a motor.
While the gears on the pump rotate, they separate on the pump's intake side. 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 whereby the meshing of the gears operates to displace the fluid. There are very small and tight mechanized clearances, which along with the speed of revolution effectively prevent the fluid from leaking backwards. The rigid fabrication of the houses and gears gives the pump its ability to be able to pump highly viscous liquids and allow for excessively high pressures.
Lift trucks and various lift trucks may have particular labels utilized in certain hazardous locations. The label indicates that this specific model of lift truck meets the minimum standards of ANSI/UL 553 intended for electric lift trucks or ANSI/UL 558 used for internal combustion engine forklifts.
Applications for marked forklifts could be found in National Fire Protection Association NFPA 505 - Powered Industrial forklifts including: Type Designations, Areas of Use, and Maintenance and Operation. Ask your local insurance carrier and Fire Marshall for additional info regarding the approved uses of industrial powered forklifts in your application.
If the lift truck has been proven to satisfy the outlined criteria, the following labels can be put. A labeled truck will have the type designation located on the forklift nameplate and would have one of the following labels placed.
