Dear, hello, it’s different. The check valve is an automatic valve. Its main function is to prevent the backflow of the medium, prevent the pump and drive motor from reversing, and release the container medium. Control valves are divided into two categories: air-opening and air-closing. The air-to-open control valve is closed in the fault state, and the air-to-close control valve is opened in the fault state. Some auxiliary equipment can be used to form a position-keeping valve or make the control valve self-locking, that is, when a fault occurs, the control valve maintains the valve opening before the fault.