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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 utilizing the meshing of gears to be able to pump fluid by displacement. These devices are commonly used in chemical installations to pump fluid with specific viscosity. Two main kinds of gear pumps exist. Internal gear pumps make use of an an internal and an external spur gear and external gear pumps make use of two external spur gears. Gear pumps pump a constant amount of fluid for each and every revolution. This defines them as positive or fixed displacement. Several gear pump devices are designed to operate as either a pump or a motor.
As the gears on the pump turn, they separate on the intake side of the pump. 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 whereby the meshing of the gears works in order to displace the fluid. There are tight and very small mechanical clearances, that together with the speed of rotation effectively avoid the fluid from leaking backwards. The rigid fabrication of the gears and houses gives the pump its ability to pump highly viscous fluids and allow for extremely high pressures.
Forklifts along with other forklifts could have particular labels utilized in certain hazardous locations. The mark denotes that this particular model of forklift meets the minimum standards of ANSI/UL 553 meant for electric forklifts or ANSI/UL 558 used for internal combustion engine lift trucks.
The application for labels used for lift 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. Ask your local insurance carrier and Fire Marshall for additional information regarding the approved uses of industrial powered lift trucks in your application.
If the forklift has been proven to satisfy the outlined standards, the following labels may be placed. A labeled truck would have the model designation located on the forklift nameplate and will have one of the following labels placed.
