A pre charged bladder tank is an expansion tank which is already charged with air.
Expansion tank pressure switch.
Most expansion tanks come pressurized to 12 40 psi but before you install the tank you have to match the system pressure.
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Start by removing the protective cover from the air valve on the tank.
Use a bicycle pump or compressor to fill the tank to match the system pressure you noted earlier.
Code requires an expansion tank only if the system is closed this absorbs excess pressure as the water heats.
The pressure switch monitors the pressure in the tank.
It informs the well pump when to turn on and when to turn off based on the rise and fall of the pressure within the tank.
Use a bicycle pump or compressor to fill the tank to match the system pressure you noted earlier.
Most households are set up to run with a pressure switch that turns the pump on at 30 pounds of pressure and turn the pump off at 50 pounds of pressure.
Use a tire gauge to check the pressure.
It uses compressed air to adjust with the pressure changes by eliminating or accepting the water volume changes as it expands or contracts due to heating and cooling.
That second valve would make it a closed system and keep your well tank from absorbing that pressure.
During this draining watch and listen to the water.
Close off all plumbing fixtures that are using water in the building.
If you do have another check valve then you would need an additional expansion tank also.
A bladder expansion tank is a system which is used for heating and cooling purposes by absorbing the expansion force.
Use a tire gauge to check the pressure.
Here is the procedure.
Start by removing the protective cover from the air valve on the tank.