As one of the core components of the dense phase pneumatic conveying system of NMT, the dome valve adopts a unique inflatable self-compensating pressure sealing technology. When the valve is completely closed, the sealing ring of this valve will automatically inflate and expand, and when the valve is open, it will automatically release air, relieve pressure and recontract, avoiding the contact wear between the valve seat and the ball top of the valve core, and greatly extending the service life of the sealing system. Through special configuration and treatment of the material of the valve body and sealing ring, as well as the surface of the valve core and inner cavity, it can be applied to different working conditions and environments (high temperature resistance, high pressure resistance, wear resistance, corrosion resistance). The dome valve is stable and reliable in performance. It can be used in conjunction with the conveying system or provided as an independent product to users.