Pumps working pressure range

Fluid power encompasses most applications that use liquids or gases to transmit power in the form of mechanical work, pressure and/or volume in a system. This definition includes all systems that rely on pumps or compressors to transmit specific volumes and pressures of liquids or gases within a closed system. The complexity of these systems range from a simple centrifugal pump used to remove casual water from a basement to complex airplane control systems that rely on high-pressure hydraulic systems. 

The pressure range is the pressure difference of the maximum pressure and the minimum pressure in which a vacuum pump can work efficiently. It is necessary to combine the different types of pumps together to generate high vacuum pressure. 

Investigations of vacuum pumps with fluidic optimised working openings and free of dead space have shown that the named pressure range can also be covered without variable pressure slots. 

Speciai working range of vacuum pumps I I Normal working range of vacuum pumps Figure 5.2 Common operating pressure ranges of mechanical vacuum pumps. 

Injection Mixes Injection mixes contain fine powders, which are injected by double-piston pumps. The pressure employed for injection is in the range of 1-20 MPa. These mixes are available in two forms—one that is ready-to-mix or one that must be mixed on site. Grouting mix is an example of an injection mix. It is injected through the steel jacket of a blast furnace and fills the gap between the jacket and the adjacent brick work to increase the cooling efficiency. 

In vacuum operation, the vacuum pump is normally in continuous operation because the reaction products, air from possible leakages, and the purge gas have to be removed in order to achieve a constant vacuum. To obtain realistic values for the pressure in the furnace chamber, the pressure meter should be installed close to the furnace chamber and not in the vacuum line leading to the vacuum pump. The working pressure is typically in the range 0.1-10 kPa. 

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