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Among the more common types of pump utilized for hydraulic fuel power applications is the gear pump. The gear pump operates by using the meshing gears to pump fluid by displacement. These devices are even usually used so as to pump fluids with precise velocities in chemical installations. Two basic types of gear pumps are available. Internal gear pumps use an an internal and an external spur gear and external gear pumps use 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 devices are designed to function as either a motor or a pump.
As the gears rotate on the pump, this action works in order to divide the pump's intake side, 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 very small and tight mechanical clearances, that along with the speed of rotation efficiently avoid the fluid from leaking backwards. The rigid design of the houses and gears provides the pump its ability to be able to pump highly viscous liquids and allow for extremely high pressures.
Lift trucks and other forklifts can have specific labels used in certain hazardous locations. The mark denotes that this particular model of lift truck meets the minimum standards of ANSI/UL 553 meant for electric lift trucks or ANSI/UL 558 used for internal combustion engine forklifts.
Applications for marked trucks can be found in National Fire Protection Association NFPA 505 - Powered Industrial lift trucks including: Maintenance and Operation, Type Designations, and Areas of Use. Check with your local insurance carrier and Fire Marshall for more info about the approved uses of industrial powered forklifts in your application.
If the certain forklift satisfies the outlined criteria, labels can be attached. A labeled forklift would show the type of designation located on the nameplate and will have a correctly corresponding label placed.