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A gear pump is among the most common types of pumps for applications of hydraulic fluid power. A gear pump works by using the meshing of gears in order to pump fluid by displacement. These machines are generally used in chemical installations in order to pump fluid with specific viscosity. Two basic 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 constant amount of fluid for each revolution. This defines them as fixed or positive displacement. Some gear pump machines are designed to work as either a pump or a motor.
While the gears on the pump revolve, they separate on the intake side of the pump. 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 where the meshing of the gears works to be able to displace the fluid. There are tight and really small mechanized clearances, which together with the speed of rotation efficiently prevent the fluid from leaking backwards. The rigid construction of the gears and houses gives the pump its ability to pump highly viscous fluids and allow for excessively high pressures.
Forklifts can be purposely marked to be used in hazardous sites. A labeled forklift denotes the design has met the minimum requirements of ANSI/UL 558 intended for engine powered trucks or ANSI/UL 583 meant for electric forklifts for the type of label placed.
The application for labels meant for lift lift trucks can be found in National Fire Protection Association NFPA 505 - Powered Industrial trucks including: Maintenance and Operation, Type Designations, and Areas of Use. Consult your local insurance carrier and Fire Marshall for further information regarding the permitted uses of industrial powered trucks in your application.
If the certain lift truck meets the outlined standards, labels may be attached. A labeled forklift will show the type of designation put on the nameplate and would have a properly corresponding label attached.
