Some pumps are designed to always have the requisite start-up liquid in the pump’s chamber or body. These are called “self-priming” pumps. Other pumps require the start-up liquid be added to the pump before initiating operation. No one type of pump is intrinsically superior to another: it simply depends on what the pump is used for and how often.
Some types of pumps are engineered to be automatically self-priming. Pumps of this nature feature close tolerance working parts that trap fluids in the pump’s body, preventing them from returning from the discharge side of the pump to the suction side when the pump is not in operation.
In these types of pumps, the constant presence of fluid in the pump’s body allows the pump to better handle what are called “air pockets”. Air pockets are an accumulation of air bubbles in the pump’s working mechanism, which can impair proper pump operation.
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