Outlet valve of the self-priming pump
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When a self-priming pump starts, the outlet valve is open – why is this different from ordinary centrifugal pumps? Is it prohibited to fully close the outlet valve when using a self-priming pump?
The self-priming pump needs to be vented, so the outlet valve should be left slightly open. The outlet valve of a conventional centrifugal pump is closed in order to minimize the starting power
Thank you. If all the exit doors are closed, the gas inside the chamber cannot be expelled, and therefore it’s not possible to continuously draw in liquid to displace the gas from the chamber, is that right?
Under normal circumstances, ordinary centrifugal pumps do not have the capability to vent the inlet pipe. A self-priming pump, on the other hand, can evacuate the suction pipe of the pump without the need for any external auxiliary devices.
The inlet valve of the self-priming pump should be fully open, while the outlet valve should be left partially open at first; once liquid has been drawn into the pump chamber, the outlet valve should then be fully opened to ensure a certain pressure difference between the inlet and outlet
The inlet valve of the self-priming pump should be fully open, while the outlet valve should be left partially open at first; once liquid has been drawn into the pump chamber, the outlet valve should then be fully opened to ensure a certain pressure difference between the inlet and outlet
The self-priming pump needs to be vented, so the outlet valve should be left slightly open. The outlet valve of a conventional centrifugal pump is closed to minimize the starting power.