The present utility model belongs to the technical field of refrigerant recovery, and in particular relates to a ventilation structure of a refrigerant recovery machine. Aiming at the lack of protection against the impact of a liquid refrigerant on a spring of an intake valve and/or exhaust valve of the existing refrigerant recovery machine, the present utility model adopts the following technical solution: a ventilation structure of a refrigerant recovery machine, including: a valve seat provided with an air hole; a valve core axially movable relative to the air hole; a compression spring mounted on the valve core: and a protection assembly provided on the valve seat, where the protection assembly is provided with an annular wall, the annular wall surrounds the compression spring, the compression spring is located at a distance from the valve seat, and a region of the protection assembly between the compression spring and the valve seat forms a radial ventilation passage. The ventilation structure of the refrigerant recovery machine in the present utility model has the beneficial effect that the impact of the liquid refrigerant in the radial airflow on the compression spring is reduced or avoided.

A check valve having a valve that is movable by incoming water in the flow direction, from a closed position, where it bears against a first valve seat, against a restoring force into an open position, where it is raised from the first valve seat, and having a pressure relief valve with a closing member that is movable by pressure of the water flowing back against the flow direction, from a closed position, in which it bears against a second valve seat, against a restoring force into an open position where it is raised from the second valve seat. The restoring force acting on the closing member is greater than the restoring force acting on the valve body. The closing member has a closing member core made of a first material, and at least in the partial region thereof that abuts the second valve seat in the closed position, has a film or a layer made of a second relatively softer and/or elastic material.