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A gear pump is amongst the most common types of pumps utilized for applications of hydraulic fluid power. A gear pump functions by using the meshing of gears in order to pump fluid by displacement. These machines are widely used in chemical installations in order to pump fluid with specific viscosity. Two basic types of gear pumps exist. Internal gear pumps make use of an external and an internal spur gear and external gear pumps make use of 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 machines are designed to work as either a motor or a pump.
As the gears turn on the pump, this action works to divide the intake side of the pump, creating a suction and a void that is filled by fluid. This fluid is carried by the gears to the discharge side, whereby the fluid is displaced by the meshing of the gears. There are tight and really small mechanical clearances, which along with the speed of rotation effectively prevent the fluid from leaking backwards. The rigid design of the houses and gears provides the pump its ability to be able to pump highly viscous liquids and allow for extremely high pressures.
Lift trucks along with various lift trucks can have specific labels utilized in certain hazardous locations. The mark indicates that this particular model of forklift meets the minimum standards of ANSI/UL 553 meant for electric lift trucks or ANSI/UL 558 used for internal combustion engine forklifts.
Applications for marked forklifts can be found in National Fire Protection Association NFPA 505 - Powered Industrial forklifts including: Type Designations, Areas of Use, and Maintenance and Operation. Ask your local insurance carrier and Fire Marshall for more info on the permitted uses of industrial powered forklifts in your application.
If the forklift has been proven to meet the outlined standards, the following labels could be put. A labeled truck will have the model description put on the forklift nameplate and would have one of the following labels attached.
