The rubber flap check valve is mainly composed of a body, bonnet, and disc. The rubber flap is made of a steel plate as the pressure-bearing component and reinforced nylon fabric as the lining, with an outer layer formed by hot-vulcanized integral rubber coating technology. The disc operates flexibly without jamming and has a long service life. The valve features a streamlined design, offering low head loss, resistance to debris accumulation, and easy maintenance.