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A gear pump is among the most common types of pumps for applications of hydraulic fluid power. A gear pump operates by utilizing the meshing of gears to be able to pump fluid by displacement. These devices are commonly used in chemical installations so as to pump fluid with specific viscosity. Two basic kinds of gear pumps are available. Internal gear pumps use an an internal and an external spur gear and external gear pumps utilize two external spur gears. Gear pumps pump a continuous amount of fluid for each revolution. This defines them as fixed or positive displacement. A few gear pump devices are designed to operate as either a motor or a pump.
When the gears on the pump turn, they divide 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 so as to displace the fluid. There are tight and very small mechanical clearances, which together with the speed of rotation effectively prevent the fluid from leaking backwards. The rigid fabrication of the houses and gears gives the pump its ability to pump highly viscous fluids and allow for excessively high pressures.
Lift trucks could be specifically marked to be used in hazardous places. A marked forklift denotes the design has met the lowest standards of ANSI/UL 558 for engine powered trucks or ANSI/UL 583 meant for electric lift trucks for the type of label placed.
The application for labels for lift forklifts may be found in National Fire Protection Association NFPA 505 - Powered Industrial lift trucks including: Areas or Use, Maintenance and Operation, and Type Designations. Consult 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 found to satisfy the outlined criteria, the following labels could be placed. A marked truck would have the type description placed on the forklift nameplate and would have one of the following labels put.
