The reseal pressure is the required back flow pressure in order for the check valve to close tight enough so that there is no more detectable flow within the check valve. It can also be described as the measure of back flow pressure when the check valve is closed bubble or leak tight. Spring loaded check valves for instance, reseal with the aid of the force of the spring. This results in a higher amount of reseal pressure required for lower cracking pressures to ensure a bubble tight seal.