Cingular valve design technology enables the valve holder and the valve seat to be tightly fitted, thus enhancing the structural stability, durability and main functions of the valve. At the same time, the force on the valve leaves is uniform, and wrinkles are not easy to be generated, so that the abrasion of the valve is relieved, and the service life of the product is prolonged; The simultaneous opening and closing of the three leaflets were well coordinated, and the effective orifice area of the valve was high.