Integrated air inlet and outlet valve and pressure swing adsorption air path system

An integrated air inlet and outlet valve, comprising a valve body, wherein the valve body is provided with an air inlet, an air outlet, an exhaust port, a first blowback air inlet and two air path control units, each of the air path control units comprises a first air inlet and outlet port and a second air inlet and outlet port, the first air inlet and outlet port is connected with the air outlet through a first one way valve which enables air to flow to the air outlet from the first air inlet and outlet port in one direction only, the second air inlet and outlet port is selectively communicated with the air inlet;

• or the exhaust port through a first control valve, the exhaust port is provided with an on-off control mechanism, the first blowback air inlet 4 is respectively connected with the first air inlet and outlet port of each air path control unit through a second one-way valve which enables air to flow to the first air inlet and outlet port;
• from the first blowback air inlet in one direction only, and the valve body is further provided with a pressure equalization control assembly capable of controlling the air outlet and the first blowback air inlet to be mutually connected and disconnected.