The Mares Dynamic Flow Control (DFC) system was developed to minimise the performance reducing pressure drop that occurs in all regulator first stages when you breathe in.
First stages use a balance of ambient, spring and air pressures to control the valve that lets gas into and through the first stage mechanism. When the intermediate air pressure within the first stage drops it causes the high pressure valve to open in order to balance the system again. the initial delay and drop in pressure is called the intermediate pressure drop.
The DFC system is an exclusive system, unique on the market, that operates in relation to the diver's actual air demand, independent of depth and tank pressure by using the Venturi Effect (also used in the second stage to assist valve opening), optimising the regulator's sensitivity and minimising inhalation resistance, especially during dives in extreme conditions.
By using the DFC system Mares Regulators are able to use simpler second stage valves without affecting performance and simpler means more reliable, easier and cheaper to maintain.