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One of the more common kinds of pump utilized for hydraulic fuel power applications is the gear pump. The gear pump functions by using the meshing gears so as to pump fluid by displacement. These machines are likewise usually used so as to pump fluids with specific velocities in chemical installations. Two main kinds of gear pumps are available. Internal gear pumps make use of an an internal and an external spur gear and external gear pumps use two external spur gears. Gear pumps pump a constant amount of fluid for every revolution. This defines them as positive or fixed displacement. Some gear pump machines are designed to function as either a motor or a pump.
As the gears turn on the pump, this action works to be able to separate the pump's intake side, creating a suction and a void 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 together with the speed of rotation efficiently avoid the fluid from leaking backwards. The rigid construction of the gears and houses provides the pump its ability to be able to pump highly viscous liquids and allow for extremely high pressures.
Lift trucks along with various forklifts may have specific labels used in some hazardous locations. The label denotes that this specific model of forklift meets the minimum standards of ANSI/UL 553 utilized for electric forklifts or ANSI/UL 558 intended for internal combustion engine forklifts.
Applications for labeled trucks can 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 information regarding the approved uses of industrial powered forklifts in your application.
If the specific lift truck meets the outlined criteria, labels could be attached. A labeled forklift would show the type of designation located on the nameplate and will have a properly corresponding label attached.