Self-priming pump self-priming height is a few meters, need not to need to install the bottom valve?

Self-priming pump pump cavity with liquid storage chamber, at the first use, must first fill liquid water pump cavity, if there any idle pump not only can't absorb fluid, still can put the pump body of the machine fittings such as burn out, so before use must first priming, self-priming pump self-priming height calculated by supernatant in 5 meters or so commonly, if liquid than major or have a certain viscosity, inlet piping bend more sluggish in other factors will affect the self-priming pump suction and self-priming height, can be met only by the under normal atmospheric pressure using 5 meters. 5 meters here is suction vertical self-priming height, generally according to the site condition and pipe laying, if within the prescribed scope, suction caused not so need not to need to install the bottom valve on the liquid absorption? Self-priming pump is generally do not need to install the bottom valve, because the self-priming pump with reservoir filling, with self-priming function, so beyond the suction, it need to add bottom valve, bottom valve inlet pipe installation, pipeline memory filled with liquid, there will not be fit, will greatly improve suction, so after installation bottom valve self-priming pump use effect will be better.
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