Pressure-bearing type lock-containing flap valve and application method thereof in water reservoir siphon water exchange

The invention discloses a pressure-bearing type lock-containing flap valve. The pressure-bearing type lock-containing flap valve comprises a flap valve seat and a flap valve, wherein the top of the flap valve seat is hinged to the flap valve through a hinge shaft which is provided with a ring seat, and an arc surface convex block is arranged on the ring seat; and one end of a flap valve opening buffer is connected with a support, and the other end of the flap valve opening buffer abuts against the arc surface convex block through an abutting head. A spring bolt is arranged on the flap valve, a spring bolt chamber is arranged on the portion, corresponding to the spring bolt device, of the device flap valve seat, a door lock linkage is arranged on the flap valve, and the door lock linkage comprises a slide way cylinder. A linkage cylinder is movably arranged in the slide way cylinder, one end of the linkage cylinder is connected with a driving device, and a linkage rod is movably arranged in the linkage cylinde