Pressure Setting All cartridges are tested for seat integrity and are pressure set at Sun Pressure settings are established at “cracking” pressure (when drops start to form a stream) and reseat is verified at 85% of setting. However, with settings below 2000 psi, reseat percentages will be respectively lower and will fall between 85-75% of setting, while keeping within stated valve pressure ranges. Reseat is established and verified to achieve a maximum of 5 drops per minute.