Double Cone Flap valves are used for controlled feeding as well as achieving air lock sealing. These valves consist of two independent Cone Flap valves mounted one upon other with their opening and closing alternated and synchronized to ensure that only one valve opens at a time. DEMECH manufacture these valves to suit the opening sizes and required through-put rate. The through-put of these valves depend on the holding volume of the upper valve chamber and the rate of operations.