Single-seat valve

The invention belongs to the technical field of valves, and discloses a single-seat valve. The single-seat valve comprises a valve rod body, a valve body, a sealing valve seat assembly and a locking structure, the valve rod body is movably arranged in the valve body in a penetrating mode, the sealing valve seat assembly is arranged at the end, located in the valve body, of the valve rod body in a sleeving mode and can abut against the inner wall of the valve body for sealing, and the locking structure is connected with the valve rod body. The sealing valve seat assembly is located between the valve rod body and the locking structure, and the locking structure is configured to clamp and fix the sealing valve seat assembly with the valve rod body. According to the single-seat valve, the sealing valve seat assembly can be clamped and fixed, the sealing valve seat assembly is prevented from being pulled out by outward pulling force under the action of the Venturi effect, the reliability of the sealing valve seat