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A gear pump is amongst the most common kinds of pumps utilized for applications of hydraulic fluid power. A gear pump operates by utilizing the meshing of gears so as to pump fluid by displacement. These devices are generally utilized in chemical installations to pump fluid with specific viscosity. Two basic types of gear pumps exist. Internal gear pumps utilize an an internal and an external spur gear and external gear pumps utilize 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. Some gear pump devices are designed to operate as either a pump or a motor.
When the gears on the pump turn, they separate on the pump's intake side. This creates a void and suction which is filled by fluid. This fluid is carried by the gears to the discharge side of the pump, and this is where the meshing of the gears operates in order to displace the fluid. There are very small and tight mechanized clearances, that along with the speed of rotation efficiently avoid the fluid from leaking backwards. The rigid construction of the houses and gears gives the pump its ability to pump highly viscous liquids and allow for excessively high pressures.
Lift trucks together with various lift trucks could have specific labels used in certain hazardous locations. The label denotes that this particular model of lift truck meets the minimum standards of ANSI/UL 553 utilized for electric forklifts or ANSI/UL 558 intended for internal combustion engine forklifts.
Applications for marked 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 info concerning the permitted uses of industrial powered trucks in your application.
If the lift truck has been found to meet the outlined criteria, the following labels could be attached. A labeled truck would have the model description located on the forklift nameplate and would have one of the following labels placed.
