Regulation valve used for sodium-cooling fast reactor top fixed shielding refrigeration gas flow

The utility model discloses a control valve for the refrigerating gas-flow rate on a fixed mask at the reactor top of a sodium-cooled fast reactor, which comprises a valve body, a flange and a valve flap. The valve body is connected with the flange through a threaded bolt; one end of a screw mandrel passes through the flange and is positioned outside the valve body, and is blocked on the flange through the matching between a screw mandrel disc and an elastic collar; the other end of the screw mandrel is connected with the valve flap through screw threads; the valve flap is positioned inside the valve body and is opened with a groove along the axial direction; and a guide finger matched with the groove is arranged on the valve body. The control valve has simple structure and convenient operation, and is well suitable for controlling the refrigerating gas-flow rate on the fixed mask at the reactor top of the sodium-cooled fast reactor.