Gear pump type according to the nature of the liquid can be divided into:
(1) Pumps (type B, type D, type sh) are used to transport clean water and clean liquids with chemical and physical properties similar to water.
(2) corrosion-resistant pump (F-type) used to transport acid, alkali and other corrosive liquids.
(3) Oil pump (Y type) is used to transport petroleum products.
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