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Among the more common types of pump used for hydraulic fuel power applications is the gear pump. The gear pump functions by using the meshing gears so as to pump fluid by displacement. These devices are likewise generally utilized so as to pump fluids with precise velocities in chemical installations. Two main types of gear pumps are available. Internal gear pumps use 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 revolution. This defines them as fixed or positive displacement. Several gear pump machines are designed to operate as either a motor or a pump.
As the gears on the pump turn, they divide on the intake side of the pump. This creates a suction and void that 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 so as to displace the fluid. There are tight and very small mechanized clearances, which along with the speed of rotation effectively prevent the fluid from leaking backwards. The rigid design of the houses and gears gives the pump its ability to pump highly viscous fluids and allow for excessively high pressures.
Forklifts could be specifically marked to be used in dangerous places. A marked truck denotes the design has met the least requirements of ANSI/UL 558 used for engine powered lift trucks or ANSI/UL 583 for electric lift trucks for the type of label placed.
Applications for marked trucks may be found in National Fire Protection Association NFPA 505 - Powered Industrial trucks including: Type Designations, Areas of Use, and Maintenance and Operation. Check with your local insurance carrier and Fire Marshall for more information about the permitted uses of industrial powered trucks in your application.
If the specific lift truck satisfies the outlined criteria, labels can be attached. A labeled forklift will show the type of designation located on the nameplate and will have a properly corresponding label placed.
