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A gear pump is one of the most common kinds of pumps for applications of hydraulic fluid power. A gear pump operates by using the meshing of gears so as to pump fluid by displacement. These machines are commonly used in chemical installations to pump fluid with specific viscosity. Two main types of gear pumps are available. Internal gear pumps utilize an external and an internal 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 fixed or positive displacement. Some gear pump machines are designed to operate as either a pump or a motor.
While the gears rotate on the pump, this action works in order 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, where the fluid is displaced by the meshing of the gears. There are tight and very small mechanical clearances, which along with the speed of revolution efficiently prevent the fluid from leaking backwards. The rigid fabrication of the gears and houses provides the pump its ability to be able to pump highly viscous fluids and allow for excessively high pressures.
Lift trucks along with different lift trucks may have specific labels for use in certain hazardous locations. The mark indicates that this certain model of forklift meets the minimum standards of ANSI/UL 553 for electric forklifts or ANSI/UL 558 meant for internal combustion engine lift trucks.
Applications for labeled lift trucks may 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 further info regarding the permitted uses of industrial powered lift trucks in your application.
If the forklift has been proven to satisfy the outlined criteria, the following labels can be placed. A marked truck would have the model description located on the forklift nameplate and will have one of the following labels put.
