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A gear pump is among the most common kinds of pumps used for applications of hydraulic fluid power. A gear pump works by using 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 basic kinds of gear pumps are available. Internal gear pumps use 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 each revolution. This defines them as fixed or positive displacement. A few gear pump machines are designed to operate as either a motor or a pump.
As the gears on the pump revolve, they divide on the intake side of the pump. This creates a suction and void 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 be able to displace the fluid. There are tight and very small mechanical clearances, that along with the speed of revolution efficiently prevent the fluid from leaking backwards. The rigid fabrication of the houses and gears provides the pump its ability to be able to pump highly viscous liquids and allow for excessively high pressures.
Forklifts along with various lift trucks could have particular labels used in certain hazardous locations. The label denotes that this specific model of forklift meets the minimum standards of ANSI/UL 553 utilized for electric lift trucks or ANSI/UL 558 used for internal combustion engine forklifts.
The use for labels used for lift trucks can be found in National Fire Protection Association NFPA 505 - Powered Industrial forklifts including: Type Designations, Areas of Use, and Maintenance and Operation. Consult your local insurance carrier and Fire Marshall for additional information on the permitted uses of industrial powered lift trucks in your application.
If the forklift has been proven to satisfy the outlined standards, the following labels can be placed. A labeled truck would have the type designation located on the lift truck nameplate and would have one of the following labels attached.
