Three-eccentric slanting plate type check valve

A tri eccentric center swash plate clack valve comprises a valve body, a valve seat, a flap and a flap shaft, wherein the flap is slantways distributed with the central line of a valve flow passage, characterized in that a sealing surface of the valve seat is a part of a slant cone, a sealing line formed between the valve seat and the flap is an approximately elliptical curve, the angle alpha between the flat surface the curve is in and the central line of the valve flow passage is 60 to 70degree, the long axis center of the approximately elliptical curve sealing line forms an angular ex-centric with the cone axis line, namely the angle beta formed between the cone axis line and the central line of the valve flow passage is 15 to 20degree, the axis line of the rotary shaft on the flap forms a central ex-centric quantity of E1 against the axis line of the cone and forms a central ex-centric quantity of E2 against the flat surface O1-O1 the sealing surface is in. On the function of a dead weight and fluid pressure the flap of the valve forms a sealing, blocks a counter flowing of the fluid with a quick closing speed and a little shock between the valve sealing surface, which meet the no interference condition of the side rotating of the valve, suitable for high and low pressure fluid transmission lines.