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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 so as to pump fluid by displacement. These machines are commonly utilized in chemical installations in order to pump fluid with specific viscosity. Two main types of gear pumps exist. 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 constant amount of fluid for each and every revolution. This defines them as fixed or positive displacement. A few gear pump devices are designed to function as either a motor or a pump.
When the gears revolve on the pump, this action functions in order to divide the intake side of the pump, creating a void and a suction that is filled by fluid. This fluid is carried by the gears to the discharge side, whereby the fluid is displaced by the meshing of the gears. There are tight and very small mechanized clearances, that together with the speed of rotation efficiently prevent the fluid from leaking backwards. The rigid design of the houses and gears gives the pump its ability to pump highly viscous fluids and allow for extremely high pressures.
Forklifts along with other forklifts can have specific labels used in certain hazardous locations. The mark indicates that this certain model of lift truck meets the minimum standards of ANSI/UL 553 for electric forklifts or ANSI/UL 558 for internal combustion engine lift trucks.
Applications for marked forklifts may be found in National Fire Protection Association NFPA 505 - Powered Industrial trucks including: Type Designations, Areas of Use, and Maintenance and Operation. Consult your local insurance carrier and Fire Marshall for additional information on the approved uses of industrial powered forklifts in your application.
If the specific lift truck meets the outlined standards, labels may be put. A labeled forklift will show the type of designation put on the nameplate and will have a properly corresponding label attached.
