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A gear pump is among the most common types of pumps used for applications of hydraulic fluid power. A gear pump works by using the meshing of gears to be able to pump fluid by displacement. These devices are generally utilized in chemical installations to be able to pump fluid with specific viscosity. Two basic kinds of gear pumps exist. Internal gear pumps make use of an external and an internal spur gear and external gear pumps utilize two external spur gears. Gear pumps pump a continuous amount of fluid for every revolution. This defines them as fixed or positive displacement. Some gear pump devices are designed to operate as either a pump or a motor.
While the gears on the pump turn, they separate on the intake side of the pump. This creates a void and suction that 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 so as to displace the fluid. There are really small and tight mechanical clearances, that together with the speed of rotation efficiently avoid the fluid from leaking backwards. The rigid design of the gears and houses gives the pump its ability to pump highly viscous liquids and allow for excessively high pressures.
Forklifts can be purposely labeled to be utilized in dangerous places. A marked lift truck indicates the design has met the minimum standards of ANSI/UL 558 used for engine powered forklifts or ANSI/UL 583 used for electric forklifts for the type of label attached.
The application for labels for lift forklifts may be found in National Fire Protection Association NFPA 505 - Powered Industrial lift trucks including: Maintenance and Operation, Type Designations, and Areas of Use. Consult your local insurance carrier and Fire Marshall for additional information about the approved uses of industrial powered lift trucks in your application.
If the specific forklift satisfies the outlined criteria, labels may be placed. A labeled forklift would show the type of designation placed on the nameplate and will have a properly corresponding label attached.