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A gear pump is one of the most common types of pumps designed for applications of hydraulic fluid power. A gear pump works by utilizing the meshing of gears to be able to pump fluid by displacement. These devices are commonly utilized in chemical installations in order to pump fluid with specific viscosity. 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 each revolution. This defines them as positive or fixed displacement. Several gear pump devices are designed to work as either a pump or a motor.
When the gears on the pump rotate, they separate on the pump's intake side. This creates a void and suction which 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 operates to displace the fluid. There are very small and tight mechanized clearances, which along 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 pump highly viscous liquids and allow for excessively high pressures.
Lift trucks could be purposely labeled to be utilized in unsafe places. A labeled lift truck indicates the design has met the lowest requirements of ANSI/UL 558 intended for engine powered trucks or ANSI/UL 583 used for electric forklifts for the type of label placed.
Applications for marked lift trucks may be found in National Fire Protection Association NFPA 505 - Powered Industrial trucks including: Maintenance and Operation, Type Designations, and Areas of Use. Check with your local insurance carrier and Fire Marshall for additional information regarding the approved uses of industrial powered forklifts in your application.
If the lift truck has been found to satisfy the outlined criteria, the following labels could be put. A marked truck will have the model designation located on the lift truck nameplate and will have one of the following labels put.
