A new annular vent valve with doublearc metal sealing structure was developed to replace the conventional rubber seal in order to solve the problem that the rubber seals used in conventional annular exhaust valves are vulnerable to failure duo to high temperature,high pressure and strong corrosive gas erosion.Finite element method was used to analyze the maximum Mises stress and contact pressure distribution and the change of contact width of metal seal of new annular exhaust valve at different landing depth.The simulation results show that when the landing depth of the new annular vent valve is less than or equal to 600 m,he maximum Mises stress is greater than the yield strength of shell material,the contact pressure is 1 to 137 times of the yield strength of the shell material,and the contact width of the seal is basically unchanged,so the metal sealing is guaranteed.The opening pressure and sealing pressure experiments were carried out for the new annular vent valve.The experimental results are in good agreement with the simulated data.The results show that the new annular vent valve has a good function of connecting and sealing the upper and lower annulus under the condition that the landing depth is less than 600 m and the sealing pressure is less than 45 MPa.