IV. Translate the following text into your native language:
Centrifugal pumps comprise a class of pumping machinery in which pumping of liquids or generation of heat is effected by rotary motion of one or more impellers. The great variety of centrifugal pumps may be reduced to a few fundamental types.
Every pump consists of three principal parts : an impeller which forces the liquid into a rotary motion ; the pump casing which directs the liquid to the impeller and leads it under a higher pressure; and a drive to put the impeller into rotary motion.
Upper limits of capacity produced by centrifugal pumps are constantly increasing. Pressures as high as 5.400 psi, are being produced by centrifugal pumps for operation of hydraulic presses. The largest pump delivers 607,000 gpm against 310 ft head, driven by 65,000 hp motors at 200 rpm. In small sizes, centrifugal pumps are produced in millions of units a year for domestic water supply and industrial use.
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