Gravity-closed inclined clack check valve

The invention discloses a gravity-closed inclined clack check valve. The check valve comprises a valve body, a bottom cover is installed on one side of the valve body, a balance chamber is installed on the other side of the valve body, a support is installed on one side of the balance chamber, a pneumatic actuator is installed on one side of the support, a driving rod is installed in the support, a double-round-head flat key is installed at one end of the driving rod, and a balance hammer is installed in the balance chamber. According to the gravity-closed inclined clack check valve, the sealing effect is achieved completely through the contact surface pressure of the check valve and a valve seat, so that the problem about zero leakage of the metal valve seat is solved at one step; the contact surface pressure is in direct proportion to medium pressure, so that high pressure and high temperature resistance is also easily achieved, the valve pressure drop can be effectively reduced, the valve has a good low-pr