What is pre-charge pressure?
Pre-charge pressure refers to the amount of gas (air is used in Flexcon tanks) in psi that is pumped into a tank prior to installation – usually at the factory. Most tanks are provided with a 28-psi pre-charge (38 psi in Flexcon’s two largest sizes). The pre-charge is the “spring” that helps to create water pressure. As the diaphragm fills with water, it compresses the pre-charge. In a 30/50 system, the pump will continue to propel water into the tank until the pressure in the tank reaches 50 psi.
