Novel valve seat of combination valve

The utility model relates to a valve seat of a combination valve. The valve seat is of a split type. During processing, the conventional valve seat as a whole is divided into a valve seat 1 and a valve seat 2, and the valve seat 1 and the valve seat 2 are respectively sealed by a double-oblique surface non-metal sealing gasket. As the valve seat can be processed into small size, the valve seat has the advantages of facilitating processes when applied to occasions of small aircraft, small flow and high pressure; particularly, the outer diameter of the valve seat of the combination valve is of phi 40 which is smaller than the minimum phi 65 of that of the convention combination valve.