Generally, how does the pressure gauge reading change after the water pump is started?
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Generally, how does the pressure gauge reading change after the water pump is started? What are the readings on the pressure gauge and ammeter after the outlet valve is opened?
After starting the water pump, the pressure gauge reading increases; once the outlet valve is opened, the readings on both the pressure gauge and the ammeter decrease.
It is strictly prohibited to close the outlet valve on positive displacement pumps – remember this!
After starting the pump, the outlet pressure rises slowly to a level slightly above the rated value (under normal operating conditions); after slowly opening the outlet valve, the pressure drops gradually back to around the rated value, while the ammeter reading increases from a low level to a value slightly below the rated value.